94MR2-T

Does anyone here run an aftermarket mid pipe or racepipe with the oem muffler? I tried searching but I am looking for maybe a sound clip and some input if you have this setup. My only other mod is a k&n typhoon2 intake...I'm not really going for overall power, I would just like a little more sound plus the flexibility that if I want an aftermarket cat back later on I can go that route.....Does a mid pipe replace the 2 cats that the rx8 comes with from factory?...Also If I purchase an aftermarket header will that bolt directly to the aftermarket mid pipe or is there another connecting pipe between them......Sorry for all the questions at once, but I am just trying to get to know my car a little better.....

Thank you

Brettus

iTrader: (2)

I have stock muffler . I removed the cat + resonator & replaced with a straight pipe - sounded awfull ! Really raspy . Soon after that I had a resonator fitted . Sounded a lot better . Still a little raspy & a lot louder than stock .
Try searching for more info.

mysql101

http://rotaryinsider.com/viewtopic.php?t=3

mikeschaefer

There are 4 things you can unbolt from a factory RX-8; in order:
1) Exhaust Manifold/combined downpipe
2) Catalytic converter/resonator pipe
3) Extension Pipe
4) Muffler/Tailpipe assembly

All midpipes, catless or not and resonatorless or not, so far replace the factory cat/resonator pipe assembly. Aftermarket headers bolt to the midpipes.

94MR2-T

Guys thanks for all the info and fast response. This board is awesome!!

dgrx8

i have your exact setup...
i have the typhoon2, oem exhaust, & b&b resonated midpipe. it sounds awesome to me!!!
not loud at all... a little more aggressive & raspy... but, real nice tone!!!
see my sig

Phantom Menace

Sounds interesting. I, too, want to keep my OEM exhaust but want it to "breathe" a little bit better. I like the "raspy" sound vs. deep "BOOOOONNNGG" drone. If you could post a sound clip of your setup at cruising speed, I'd appreciate it?

Thanks.

SoFL_RX8

I have the Rotary Performance resonated catless mipipe, now with the RX8Store catback, but before just with the stock exhaust. It sounded a little raspy at first but broke in to a deeper tone. Barely noticable at idle but from 4k to redline it sounded real nice. Noticeably louder than stock.
Now with the RX8store exhaust it screams at anything more than lite throttle. I wouldnt say it has much of a BOOOOOONG drone to it though Its got a very sporty, deep note. Its a tad louder than Id ideally want, but w.e. it sounds fricken fantastic.

Moonrover333

i'm running b&b midpipe and stock exhaust, i hate it, too raspy for my taste very tingy. but to each there own. i would rather be louder with good tone than quiet and buzzy

mysql101

I had a hell of a lot more rasp with the borla and the b&b when NA than with the stock exhaust. It didn't sound too bad with the b&b + hks, so be careful with your exhaust choices if you do this.

Of course, going turbo means it doesn't matter which you choose. It's going to lose the rasp and quiet down a lot.

WarmFreedom

i have a 6MT with MS muffler, i removed the cat but retain the stock resonator, and inplace of the cat was a 2.5 inch piping.

awsome power unleashed. but it had a raspy sound (but not as bad as a cheap *** civic) when under load above 3.5Krpm

next i installed a KNN drop in air filter, somehow it has toned down the rasp,
now the power is good and so is the sound.

Landon

Not to hijack here but dont you get a CEL when you throw on a mid pipe? if so how do you get rid of it because I want to get a midpipe?

mysql101

I can't tell you how to get rid of the midpipe CEL, but I can tell you that I had the midpipe installed on my car before the turbo, and I would get a CEL after about 15 minutes of driving.

Once I had the turbo installed (with both the int-x and emu) I never picked up the missing cat CEL again....

8is>enuff

I have the revi, a high-flow cat and the stock exhaust.

I'm not a fan of loud aftermarket exhausts, and my combination gives a throaty growl without sounding obnoxious or ricey. I'll work on getting a video/audioclip today or tomorrow if anyone's interested. I've been promising one for a while.

WarmFreedom

nope i didn get a CEL,

i just removed the Cat portion of the mid pipe , only the cat, leaving the stock resonator alone, then in place of the cat was a 2.5 inch piping, i re connect the sensor just about the same location as it previously was.

is yrs auto or manual?mine is manual

N10S

Yep....I would definitely like to hear an audio clip of that combo.

Based on what I have read on this forum, and through a discussion with one of the guys that sells the RP Supercat, replacing the factory cat results in better power gains than replacing the catback section (if you could only choose 1 or the other) alone. Obviously replacing both will net the best results overall, but the combo of both high flow cat (or straight-thru race pipe) and many of the aftermarket cat-backs seems to result in too much noise. The guy selling the RP Supercat did say the sound of the stock catback with the RP supercat was more raspy sounding though. Loud is subjective of course, and so is raspy, so I think being able to get a good recording of this combo will be helpful.

Thanks in advance for helping out with the audio clip!

Jeff

jzrx8

for the people with straight pipes/test pipes/race pipes etc. what are you doing to prevent CELs? spark plug defoulers, O2 simulators? I am looking at the defouler route but i am wondering how many to use and which you guys are using.

Thanks,
Jay

mysql101

we all reconnect the sensor that was in the cat to the bung on the catless midpipe.

The car detects the air before and after the cat, and compares. I haven't heard of any success stories from defoulers or simulators.

8is>enuff

The above was my reasoning as well. I'm happy with the choice I made, save for the tiny stock exhaust tips.

I'll get the video today or tonight.

8is>enuff

I'm still working on it. It's been cold and snowing on and off for the past few days. I haven't forgotten about this, and should have the clip up this week.

I'm going to do one of a cold start-up, warm idling, a drive-by or two and one cruising inside the car. That should cover it unless you guys have any other suggestions.

tksnobords

i'm thinking of taking my cat out...but it looks like the cat and resinator are connected...does anyone know if they unbolt from eachother? or if they are one piece?
view my thread
https://www.rx8club.com/series-i-tech-garage-22/more-sound-out-stock-exhaust-113720/

eviltwinkie

I have the rx8store midpipe (thanks mike!) and the stock catback...and to be quite frank...while it does give you a noticeable boost in performance...it also increases the amount of sound produced above 4k significantly. The first impression was after 4k it sounded almost like the pipe was vibrating and contacting metal creating a very ricey sounding buzz. I at first started to wonder if I left something loose so I went down and rechecked everything...but that was not it. I then took it to a shop and got it up on a lift thinking that it needed a hanger...but the only place that comes close to hitting is where the midpipe and header meet. In that area the clearance between the transmission and pipe is very tight...so I assumed that perhaps its vibrating against the transmission. I then did forum search after forum search and the only things I found were...it could possibly be the factory system heat sheilds vibrating...or its a "normal" noise which was once muffled by the factory cat/resonator which is now coming out due to the midpipe.

Its very annoying to me, but I can live with it for now. It has made me want to purchase an aftermarket catback to eliminate the possibility that the OEM system is creating the noise. I am also planning on purchasing some high temp header wrap to wrap the midpipe near the tranny to also eliminate that possibility. Longer term I plan on purchasing a supercat and sell off the midpipe which brings me to my final point on this subject.

THERE IS NO WAY TO AVOID THE CEL W/ A MIDPIPE. Dont waste your time or money on the foolers. Unless you go turbo or do significant real tuning the O2 sensor is going to figure something is wrong and throw the CEL. It's annoying for sure but its unavoidable if you plan on running a stock setup w/ a midpipe. I would recommend going to a supercat if its a major concern. Not only will it prevent throwing a CEL, but it also gets rid of the last side-effect of running a midpipe. The STINK...personally I dont mind the smell anymore, but trust me when I say that it permeates EVERYTHING and it follows you if you have been driving your car for a while with the windows down. I got to the point that I would drive with the windows up and the air set to recirculate simply to avoid getting whiffs of the smell while sitting in traffic.

Everything has a tradeoff...going to a midpipe frees up power at the cost of stink and CEL. Going to a high flow cat removes the stink and CEL but is significantly more expensive. But if you want to have it all...you gotta pay to play, and you get what you pay for...most of the time.

Me...I want power now...deal with the side effects for a little bit...and move up later when I get an opportunity...and havent already allocated my money to something else I think is more important...to each thier own...

I'll see if I can post a sound clip for you tommarrow...80 degrees in texas...however 48 hours ago it was 32 and icy...gotta love texas weather...haaa

Brettus

iTrader: (2)

I still can't understand why you all get a cel when the cat is removed . I took mine off two years ago and have never had a cel .

eviltwinkie

Its probably cause your dash light burned out...haaaa

Brettus

iTrader: (2)

ha ha -knew someone would say that .
But no .....