Just a few questions before I decide to spend my money on it. I tried searching and probably searched for the wrong thing cause these are simple questions I'm sure have been asked but I didnt find the answer, so: on the RP site it says the supercat is for off-road use only which I assume to be becaue of noise? is there any other problems or reasons it should only be off-road? not too concerned because it says it is street legal though. My other question is: I saw in a thread about the supercat someone asking if there were fitting issues with the RB exhaust and never saw an answer to the question. is there anything to it? or should it fit fine? any responces are appreciated, Thanks :wavey:

supercat is fine for street. it even passes smog still. if you get a hanger put on the supercat then there will be no fitting issues. i have the supercat w/ hanger welded + the rb exhaust.

It will not have any issues with fitment on any exhaust that can be fitted to the stock cat.

its off road only because its not CARB certified, but since you don't live in california it doesn't matter since it will pass a sniffer test and does not cause a CEL

supercat is fine for street. it even passes smog still. if you get a hanger put on the supercat then there will be no fitting issues. i have the supercat w/ hanger welded + the rb exhaust.

Did they send it with hanger welded or did you have it added during install?

i had one welded on during the install. as far as i know at the moment. RP isn't offering the hangers.

Thanks for all the responses. Where exactly do you have a hanger welded on? I dont know how to weld or know where I'd have that done so I'd definitely need to figure out where I could have that done.

what you can do is install it, and take your car to a muffler shop and tell them you want a hanger installed. they'll lift your car up and put the hanger in and weld it. way cheaper than having them install the whole thing too.

hanger pic :)

supercat is fine for street. it even passes smog still. if you get a hanger put on the supercat then there will be no fitting issues. i have the supercat w/ hanger welded + the rb exhaust.


Same with me, no issues.

what you can do is install it, and take your car to a muffler shop and tell them you want a hanger installed. they'll lift your car up and put the hanger in and weld it. way cheaper than having them install the whole thing too.

Thats what I did, they charged me $17 at Jensen Auto.

yea... i didn't do that... lol i had them install it all for me and i felt ripped off. haha. damn deedubb said it wasnt guna cost all that much.

is it just not secure enough without that hanger? what problems would/could I have without the hanger?

actually. some haven't had any problems without a hanger, but i didn't want to take that chance. most problems people had were rattling because there was no hanger.

9,000 + miles without a hangar and no problems here. RP supercat is an outstanding product. If you have any questions, call them and speak to Chris. He's very knowledgeable and responsive to all questions.

I have that cat with the stock exahust, and I got that weird vibrating as I didn't have the extra hanger. You have to solutions, one, get a hanger installed in the factory location, or two, what I did, remove the two chasis braces along the exahust tunnel, which really don't do anything.

I'm waiting for the standalone hanger to come out from RP, and then I'll install it. If you want to check to see if this is your issue, remove the two braces from under the car and see if you still hear the noise.

I have a stock exhaust with RP super-cat and have no vibrations or cels...Granted I only put it on over labor day weekend. Lovin it so far! :rock:

do you guys really feel any difference in having a "super-cat"

I'm sure that questions been asked before, but to me it would make more sense just to remove the cat and have pipe only. I know it's illegal, but lots of people do illegal things...

yes,

i have something close.. but big change.... and as to no cat ... did it. not something i would deal with day to day..


beers :beer:

I have no hanger installed and no rattle. It is not much louder than it was before, just a bit angrier. I have had a racing beat exhaust installed since it came out. All and all I am happy with the purchase.

I have no hanger installed and no rattle. It is not much louder than it was before, just a bit angrier. I have had a racing beat exhaust installed since it came out. All and all I am happy with the purchase.
I could see a nice blue glow coming from his exhaust when he shifted. :)

I'm thinking of getting it but... I am wondering if its legal to have it installed. I live in California so i'm kinda concerned.

i have mine about a year now... no problems and still no hanger

... or two, what I did, remove the two chasis braces along the exahust tunnel, which really don't do anything.


Those braces are important for preventing chassis twist & flex, highly recommend that you reinstall them.

It is Illegal to remove a perfectly good operating cat in CA. A lot of Muffler shops will tell you this when you ask them to put on a high flow cat or do anything with the cat for that matter.. But they would still do the work for you maybe on a "side job" basis. When you get a smog test as long as it passes the snuffer you would be ok.. The normally do not look at the cat unless your car is all modified and it does not past the snuffer for other reasons.

im not from CA - but even here in texas, the mazda techs didnt phsysically look at my CAT on the "big" recall i just went thru... when i told them i had a custom SuperCAT they flipped out and were just weird/stupid.

the RP superCaT is highly reccommended.

Hay Guys.. I just got my RP Supercat on Monday.. I didnt put it on as soon as I got it like I wanted to because I had the BIG recall thing.. Yesterday morning I took it in to Browning Mazda in Cerritos CA. They told me it was going to take a Day or two... I was like AUG!!... But oh well... They said they have a rental car for me... I went next door to the Dodge Dealer they had an Enterprise rental car place in the office... The Mazda Dealer paid for it but they gave me a dam KIA Spetra... AGGG... I asked the person helping me if it can go on the freeway and she told me it could... (she was right.. It could.. but she failed to mention Only in the slow lain." Any way Mazda called me arround 4 pm and said my car was ready... I picked it up. Everything was ok with my car... Only needed on leading spark plug changed. and the reflash.. that was it...

OK.. now with the RP SUPERCAT STUFF..

Like a dummy... I sprayed the cat with "high Tem spray paint" ....... I must say.. DO NOT DO THIS!! It does look very nice after I did it.. but when I put it on.. lastnight and drove it... IT was smoking and smelled bad... I guess the paint was not that good to take the heat.. But... anyhow... The car drove very nice.. felt like it flowed better. I havent got to take it to very high RPMs. but as I went faster It felt better and better.. The only thing I don't like is the noise.. For me.. I have a Greddy exhaust and it is LOUD. But not raspy at all... More of a loud rotary sound.. Kinda nice sounding in a way... But for the most part.. after the paint burned off it is a Great part and Im happy.. I may still get a Dynomax Bullet put in for the sound but I will drive it more to see how it is going.

Hay Guys.. I just got my RP Supercat on Monday.. I didnt put it on as soon as I got it like I wanted to because I had the BIG recall thing.. Yesterday morning I took it in to Browning Mazda in Cerritos CA. They told me it was going to take a Day or two... I was like AUG!!... But oh well... They said they have a rental car for me... I went next door to the Dodge Dealer they had an Enterprise rental car place in the office... The Mazda Dealer paid for it but they gave me a dam KIA Spetra... AGGG... I asked the person helping me if it can go on the freeway and she told me it could... (she was right.. It could.. but she failed to mention Only in the slow lain." Any way Mazda called me arround 4 pm and said my car was ready... I picked it up. Everything was ok with my car... Only needed on leading spark plug changed. and the reflash.. that was it...

OK.. now with the RP SUPERCAT STUFF..

Like a dummy... I sprayed the cat with "high Tem spray paint" ....... I must say.. DO NOT DO THIS!! It does look very nice after I did it.. but when I put it on.. lastnight and drove it... IT was smoking and smelled bad... I guess the paint was not that good to take the heat.. But... anyhow... The car drove very nice.. felt like it flowed better. I havent got to take it to very high RPMs. but as I went faster It felt better and better.. The only thing I don't like is the noise.. For me.. I have a Greddy exhaust and it is LOUD. But not raspy at all... More of a loud rotary sound.. Kinda nice sounding in a way... But for the most part.. after the paint burned off it is a Great part and Im happy.. I may still get a Dynomax Bullet put in for the sound but I will drive it more to see how it is going.

Very nice review. I also have a Greddy exahust and now I can expect what kind of noise it will produce.

Well, I should get mine in tomorrow or friday... I just moved for college and kinda screwed up the address when I ordered... put my old street address + new city/zip code :doh: but I should be able to fix it tomorrow I think (hope). I have RB exhaust and intake, I'll let you all know how it is when I get mine in and installed.

does it void the warrinty? while im asking, does my borla exhaust void the warrenty? how bout an intake like aem cai, or k&n short ram? i know this is kinda off topic but if someone could answer that would be great

does it void the warrinty? while im asking, does my borla exhaust void the warrenty? how bout an intake like aem cai, or k&n short ram? i know this is kinda off topic but if someone could answer that would be great

All of that can void your warrenty.

does it void the warrinty? while im asking, does my borla exhaust void the warrenty? how bout an intake like aem cai, or k&n short ram? i know this is kinda off topic but if someone could answer that would be great

kinda, in most cases it voids warranty on that part alone. the exhaust should be exhaust warranty only. not too sure about intakes though.

are you able to hear the supercat when you are on the highway or cruising or is it just when on the gas??? i know that with my greddy exhaust its pretty quiet on the highway and i'm just wondering if this will be the same. thanks

I finally had to go with a cat and obviously since it's an RP Supercat I had to have it. I also have a Hymee cat back. It was too loud for my taste when I put it on. I'm an old fart so it might be just my taste. I had a resonator welded in but there was little space left for much of one. It is kinda nice when I want to show off but still a little over for me most of the time. I'm going to see if they can put a bigger resonator in the pipe further up. If not I can get along with it.

On the quality side it is a very nice part and I have no problem with it having RP on it. j/k ;) :rollingla
I have no idea what all the flack is about a hanger, seems just fine the way it is.
I have no rattle even with the added weight of the resonator.

I always thought you made the RP supercat, until some forum members posted Rotary Performance on one of the threads a long time ago
________
VAPORIZER VOLCANO (http://volcanovaporizer.net/)

Now axial flow supercat would be cool!!!....... turn the afterburner on!
________
SageMontana cam (http://camslivesexy.com/cam/SageMontana)

uHm..... just one dumb question.. after install a supercat does fire comes out of ur exhaust when u shift at high RPM? cuz... that's something i dont want.. LOL i live in CA and i dont wanna get pull over... it's a huge fine....

It does. Hack you can even get fire from the stock system if you try hard enough.
________
MEDICAL MARIJUANA SEEDS (http://marijuanaseeds.org/)

you have to really drive it hard if you want flames. but yes, it can happen even with stock.

On the quality side it is a very nice part and I have no problem with it having RP on it. j/k ;) :rollingla


Always wondered your take on the cat RP. :D:

are you able to hear the supercat when you are on the highway or cruising or is it just when on the gas??? i know that with my greddy exhaust its pretty quiet on the highway and i'm just wondering if this will be the same. thanks
does anybody have an answer to my question???? :scratchhe

If it is anything like the SR you should be able to hear it driving down the highway. If you have the resonator installed, it will be a little more subtle.

Deeper tone, more noise when letting off the gas. I have the Greddy and it gives a nice tone when shifting gears. Coupled with a blow off valve I am sure it will sound awesome.

Oh and more noise when stepping on the gas especially when going through an underpass. Quite a bit more growl. :evil_laug

You know that subtle boom sound when shifting? Magnify that by ten and you will have it. ;)

cool thanks for the response. and with the addition of the supercat that nice little boom at the shift should also come with some flame action :rock:

I don't hear the cat unless I'm on the throttle hard with the stock exhaust. Cruising around the RP is just as quiet as stock for me at either 40mph or 70mph

well i just ordered one last night so hopefully ill get it soon

I just got my supercat today but I was wondering what is the lone welded hex bolt there for? :Freak_ani

I just got my supercat today but I was wondering what is the lone welded hex bolt there for? :Freak_ani

pics,
where is it..

beers :beer:

i have the supercat with sp2 exhaust and it is loud as hell!!! im not too fond of it and am now looking to switch to the hks legamax instead of the sp2. also i had the heat sheald, that comes welded on the cat, fall off wi=hile driving down the freeway the other day???

P.S the greddy sp2 and rp supercat combo will get flames to come out of the tips once its warmed up ....but i would recomend a set of earplugs,...haha

you need to answer this?

http://www.rx8club.com/showthread.php?t=100773

beers :beer:

pics,
where is it..

beers :beer:

Here are those pics. I have an sp2 and now I am hearing sp2 combo with the supercat gets its very loud. Is it something I should worry about since I do live in CA? :Eyecrazy:

http://img.photobucket.com/albums/v89/laserkei/Picture002.jpg

http://img.photobucket.com/albums/v89/laserkei/Picture001.jpg

Here are those pics. I have an sp2 and now I am hearing sp2 combo with the supercat gets its very loud. Is it something I should worry about since I do live in CA? :Eyecrazy:

http://img.photobucket.com/albums/v89/laserkei/Picture002.jpg

http://img.photobucket.com/albums/v89/laserkei/Picture001.jpg

The nut in the pic is, of course, to connect the sensor. Look under the car and you'll see the sensor connected to the stock cat.

I had the Super Cat.. Nice product but far too loud for me.

I do have the SP2 and the Supercat.. It Is LOUD DEN A MUH FUH...It is made very well and fits great.. Even without the hanger I have no issues at all with it hanging down. I have never seen any flames because I am the only one who drives my car. But I can tell by the sound sometimes I am spitting some out. The car feels great on the freeways and the sound becomes a bet more bearable on the free ways but in lower RPM range its loud. I know there are some people who have a resonator welded in to help with sound and this is supposed to help a lot. I may do this when I get some extra doe.

All exhaust will be Far louder with the RP Supercat over the stock cat. So having an HKS or SP2 or Racing Beat whatever IT will be far louder than with the stock cat set up..

At first the supercat is very raspy and cheap sounding but as you break it in it sounds much better. I have gotten 2 exhaust noise tickets since ive had it on and I live in the suburbs of Chicago, so it definetely draws more attention.

I do have the SP2 and the Supercat.. It Is LOUD DEN A MUH FUH...It is made very well and fits great.. Even without the hanger I have no issues at all with it hanging down. I have never seen any flames because I am the only one who drives my car. But I can tell by the sound sometimes I am spitting some out. The car feels great on the freeways and the sound becomes a bet more bearable on the free ways but in lower RPM range its loud. I know there are some people who have a resonator welded in to help with sound and this is supposed to help a lot. I may do this when I get some extra doe.

Where do I get this resonator?

SWOOP, there is pictures posted here of the heat sheild and i posted a link of the heat sheild !!! what more do you want .....if youd like ill go fetch the heat sheild off the side of the freeway and send it to you.....would that convince you

SWOOP, there is pictures posted here of the heat sheild and i posted a link of the heat sheild !!! what more do you want .....if youd like ill go fetch the heat sheild off the side of the freeway and send it to you.....would that convince you

yes,

get it of the freeway.. now ;)

that is a new design change... did you get it in the group buy????

beers :beer:

I got mine after group buy was over and it had the heat shield

I had the RP supercat until i took the car in for all the recall stuff. the cat was setting off some sensors at the dealership so they had to take it off and put a new stock cat on to keep my warranty.

I want to put it back on, but i took it to at muffler shop here and they said they could not put a used cat back on my car. i'm thinking about putting it back on myself, the only thing keeping me is my friends say that it doesn't sound as raspy now with the stock cat. anyone know why its making that raspy noise? i had it on for about 5000 miles, it should have broken in. right?

the rp supercat is raspy.

Are test pipes with resonators as raspy as a supercat?

the rp supercat is raspy.Yes it is. Are there any that arnt?

how does the RP supercat sound with a cat back system? is it still raspy or does it sound a little bit different? i know it is a lot louder with the RP cat and a cat back system, but what kind of tone does the combination have??

IT is raspy at times. At low RPM's you get the Rice Raspies....

IT is raspy at times. At low RPM's you get the Rice Raspies....

I know you think that the full exhaust is a little too loud, but over all do you like it, or do you think it's too loud and annoying?

with the greddy sp2 it is loud and obnoxiuose. i dont like it at all so im looking to switch to HKS legamax. and ya right aroun 3500-4000 rpm it gets a little raspy but once you get past that it smooth.

i personally ordered mine and didnt recieve it for about 3 weeks after placing the order because rx7store.com mixed my order in with a group buy but wen i caled they caught it and took care of the shipping so it was worth the wait.

With the HKS Legamax it will be the same thing. My friend has that exhaust and cat set up and it is very similar to mine :( I do like the set up but it does get on my nerves sometimes. I Will buy a resonator to put in to help with the sound.

I had the RP supercat until i took the car in for all the recall stuff. the cat was setting off some sensors at the dealership so they had to take it off and put a new stock cat on to keep my warranty.

I want to put it back on, but i took it to at muffler shop here and they said they could not put a used cat back on my car. i'm thinking about putting it back on myself, the only thing keeping me is my friends say that it doesn't sound as raspy now with the stock cat. anyone know why its making that raspy noise? i had it on for about 5000 miles, it should have broken in. right?

i have the supercat with borla and it was raspy because there was a gap between the exhaust and the cat. after i tightened the gasket, it only sounds raspy when the cat is cold. but once the cat heats up then the rasp goes away. (it only takes 2-3 minutes for it to warm up). and now im lovin the deep tone my exhaust gives out. by the way, its easier to do when you have another person help you.

Part of the raspy when cold is due to the airpump that runs till it warms up.

The resonator is what calms the noise down. The stock cat has a fairly large resonator after it. ;)

ya i only notice the raspy noise wen the car is warming up. after its warmed up........no rice rasp.........just rice loud..... i know the hks will still be loud but it has a different tone ....not as ricy i think. gives more of a solid ...rotary noise. i dunno. im still debating. its a lot of dough$$$

I just installed the newest version of the Supercat yesterday, and have driven it for about 75mi. Honestly it is not nearly as loud as some reviews lead me to beleive, and sound clips do no justice.

Nice mellow deep tone that still preserves the rotary sound. MY SUPERCAT HAS NO RASP WITH STOCK CATBACK. Really screams at full throttle, but still tame around town.

It is coupled with the RB duct and K&N v2. I have noticed all around better accel. feel. Recommended.

I just installed the newest version of the Supercat yesterday, and have driven it for about 75mi. Honestly it is not nearly as loud as some reviews lead me to beleive, and sound clips do no justice.

Nice mellow deep tone that still preserves the rotary sound. MY SUPERCAT HAS NO RASP WITH STOCK CATBACK. Really screams at full throttle, but still tame around town.

It is coupled with the RB duct and K&N v2. I have noticed all around better accel. feel. Recommended.

Well, maybe when you have an aftermarket catback exhaust it would be alot louder.

i just installed my supercat as well. i have the sp2 installed as well. it sounds sexy is say from 1-4 rpm. from there its noticably loud but very tolerable as i dont reach there during regular cruising. this cat has no rasp from what i can tell. only from a cold start but your supposed to warm it up anyway =p.

no hangar either and no rattle so im happy with it. ima try to get in some fire shots as well to show you guys(thank you for the repeated camera shot taking option thing. =x

oh yea. and i can feel the difference in driving =p

theres been alot of talk about these things going out at about 10,000 miles or so. has anyone here had theres on that long without any problems? it might be juat a few people with this problem but reading about the problems people were having with the supercat made me think twice about getting it myself.

I just installed the newest version of the Supercat yesterday, and have driven it for about 75mi. Honestly it is not nearly as loud as some reviews lead me to beleive, and sound clips do no justice.

Nice mellow deep tone that still preserves the rotary sound. MY SUPERCAT HAS NO RASP WITH STOCK CATBACK. Really screams at full throttle, but still tame around town.

It is coupled with the RB duct and K&N v2. I have noticed all around better accel. feel. Recommended.I'm curious - I hear you get a few hp from the Supercat, but is there any performance reason to go aftermarket cat-back other than sound preference?

(BTW, I'm jealous that you live so close to VIR. :mad: I was there twice this year with Mazdadrivers.com)

theres been alot of talk about these things going out at about 10,000 miles or so. has anyone here had theres on that long without any problems? it might be juat a few people with this problem but reading about the problems people were having with the supercat made me think twice about getting it myself.

As far as I know it is just myself and one other that had theirs die at 10,000miles.

I'm curious - I hear you get a few hp from the Supercat, but is there any performance reason to go aftermarket cat-back other than sound preference?

(BTW, I'm jealous that you live so close to VIR. :mad: I was there twice this year with Mazdadrivers.com)

It is my understanding that aftermarket catbacks will not flow any better than the stock one. I think it is just a sound preference. My only thought is that if you retune the ecu (ie racing beat flash) you may see slightly better gains with an aftermarket catback. The rep at racing beat told me that they have seen an approx. 10-15hp increase with their flash when used with a highflow exhaust setup, compared with the stock exhaust.

I'm trying to make down to VIR soon. Hit me up if your planning a trip!

BTW, I've got about 200 mi. on my supercat, and I have no complaints whatsoever. Still no rasp, and no rattling, knock knock.

Keep an eye on the Mazdadrivers.com site. This year they had an event at VIR in March. Next year's schedule isn't out yet, but maybe they'll do another one around the same time frame? For that matter, other clubs do HDPE events at VIR too, so keep an eye on the VIR site as well - http://www.virclub.com/vir/

ya... I recently... randomly? decided to run without a cat a feel how it reacts...

I ain't trying to jack this thread... but... Wow, it's made me discover new vibrations within the car I never knew I had! It's so loud I try to run at a 1/4th of throttle atleast! If else i'd be asking for attention...

So my questions comes down to with a high flow cat does the sound change at all?

*Thinking about high flow cat* - cause stock shucks my nuts

can we get some sound clips!

The way the highflow cat sounds really depends on what kind of exhaust you have. I have an HKS exhaust and the thing sounds like a freaking race car, and it pops flames too. There is another local guy that has it with a Racing Beat and his car sounds alot quiter than mine, but one thing is for sure, it is still VERY loud. Especially when you first put it on, then it calms down within a month. That first month it sounds very raspy and annoying, but after that, it sounds real good. If I had the means to put a sound clip on here I would, but as of right now I got nothin.

With the stock catback it is just a deeper tone and is not too loud at all. Does not drone either.

I have started to notice a very small amount of rasp when cold near 4k-5.5k rpm, and I didn't notice it when new, but only now with about 600mi. on it??

mine has always had that rasp at that point in the powerband, I have ~1000 miles on mine

As far as I know it is just myself and one other that had theirs die at 10,000miles.

i hope its not the norm cause i would really like to get one. but i think for now i`m gonna wait for a few other people to hit that 10,000 mark and see how it goes. Anyways.... theres still 100 things i wanna get for my 8 untill i finally deside

As far as I know it is just myself and one other that had theirs die at 10,000miles.

when did your purchase your rp hf cat? was there any modifications to the new batches besides the heat shield?

few questions
1.also any cels? do you need one of those o2 fooler chips or somethign? cuz i had the SR motorsports hf cat ann never had a ce but i sold it.. i really miss it so im looking for another hf cat.. any one had both and feel a difference?
2. resonators... do they restrict air flow?
3. ive read a few threads... no one posted anythign about mpg... anyone noticed a mpg difference? i feel i lost 1-2mpg since i sold my hf cat

any help would be greatly appriciated.

anyone got sound clips of their supercat?

bump

anyone got sound clips of their supercat?

Where do you live? Maybe you can hear it in person! Lots of nice members around here love to have any excuse to make rotary music.

... no one posted anythign about mpg... anyone noticed a mpg difference? i feel i lost 1-2mpg since i sold my hf cat

any help would be greatly appriciated.

well my mpg is shot down the drain. and thats all i have to say about that lol.

well my mpg is shot down the drain. and thats all i have to say about that lol.
so you got worse mpg with the rp hf cat?

Got my RP Supercat fixed back up (replaced) at Rrotary Performance in Garland TX (im local)

Chris took care of me and really cares about his customers. Good people. and the SuperCAT is a good product :)

Got a CEL from the supercat???? well i got a CEL on the way to work so wen i got off work i went home, disconected the battery, and replaced it with the stock cat in my driveway.....no more CEL so the Super cat stays off!!! :sad:

There's an enlightened approach... :icon_no2:

so you got worse mpg with the rp hf cat?

yes i do. i used to run a stock setup. now with the sp2 and the bonez its a little more noticably less compared to a stock. ill run numbers after i burn half a tank =/

yes i do. i used to run a stock setup. now with the sp2 and the bonez its a little more noticably less compared to a stock. ill run numbers after i burn half a tank =/

did you get those numberS? i thought the less restricted flow from the hfc = better mpg

probably just from stepping on the gas more than before

actually slayers right, it was just me stepping on the gas for the flames!

lol i still get the same numbers tho for a full tank then i did before the setup. imo you should get the cat, its sexy.

actually slayers right, it was just me stepping on the gas for the flames!

lol i still get the same numbers tho for a full tank then i did before the setup. imo you should get the cat, its sexy.

I do the same thing ;)

Got a CEL from the supercat???? well i got a CEL on the way to work so wen i got off work i went home, disconected the battery, and replaced it with the stock cat in my driveway.....no more CEL so the Super cat stays off!!! :sad:



Anyone else get a cel with a supercat?

No CEL here.

Had mine on for 3 months and a few thousand miles....and no CELs

i get 110 (underestimating) roughly for half a tank. =p

i go half and half highway city miles so yea =x

has anyone tried this combo (ie. RP Supercat and cat-back exhaust) with a aftermarket header?? Will this be WAY TOO LOUD? Or just a major lose of back-pressure and low rpm power?

has anyone tried this combo (ie. RP Supercat and cat-back exhaust) with a aftermarket header?? Will this be WAY TOO LOUD? Or just a major lose of back-pressure and low rpm power?

Almost nobody here has an aftermarket header. Have not shown any substantial gains, and crazy expensive ($1000+). There was an outfit here that sold an inexpensive header but from what I remember design was average, and did not show any gains. A well known company is in the process of developing a header that has shown some gains, but it has not been introduced yet.

Got a CEL from the supercat???? well i got a CEL on the way to work so wen i got off work i went home, disconected the battery, and replaced it with the stock cat in my driveway.....no more CEL so the Super cat stays off!!! :sad:
Your CEL probably cleared since you disconnected the battery. Prolly would have cleared with the RPCat on.

I installed mine yesterday, it only took 45mins. i still have stock exhuast but damn it sounds nice and u can feel it pull up high. my only prob is that at low rpm's and when its cooled it sounds alittle too much like rice

The ricey rasp should go away for the most part once it's broken in. You may still have some rasp when its cold, but after a few miles and its warmed up it will go away.

thanks man, aslo dew u think the dealership will say ne thing when i take it in

O.K. I just read through this thread and am contemplating a high flow cat. I have the MS exhaust currently. So here goes the questions again...

1. How loud would the supercat be with the MS exhaust?
2. How much power would the cat add alone?
3. Should I be concerned about clearance issues if I had the MS suspension?
4. CEL concerns?

I would recommend a resonated high flow cat with the MS exhaust. Unless you like hearing the exhaust rip all the time. ;)

Shouldn't get a CEL till it clogs up. :sad:

Power: you will lose some torque in the low end of the RPM range but will gain in the higher (over 4k).

you shouldn't lose any low end torque on a zero overlap Renesis engine regardless of how big/free-flowing the exhaust is i.e. Turbo XS exhaust, if you do it's because of some other dynamic issue

bigger is better on this engine, unfortunately it's also louder too

That is what I have seen first hand on my car and I have swapped back and forth a handful of times. :dunno:

we need an expansion chamber:)!
olddragger

Thanks for the info! I am still torn between doing it or not doing it. I may just wait for the Cobb tuner first, then do the Hi Flow last....

we need an expansion chamber:)!
olddragger


well maybe .... :)

we need an expansion chamber:)!
olddragger
that is what i was thinking the other day. but i couldnt find information on calculating the dimensions of the chamber and how it would collect, if it would work at all.

I think he's referring to my custom exhaust manifold, which is not really an expansion chamber, it's really more of an old-style megaphone header

Bingo.
OD