A couple of RX-8 owners who autocross/track their cars have expressed an interest in this product. Dave @ Davesport needs at least 5-6 people who are willing to buy one before he'll order another batch from his supplier.

Product description from the Davesport website follows:
Exhaust : Performance Metal Core Catalytic Converter, 100cpi

http://www.davesport.com/davesport/images/items/dcat100.jpg

The Davesport metal core catalytic converter is an extremely durable, high flow catalytic converter ideal for race and rally cars, off road vehicles, or any application needing a high flow, longer lasting cat that can take a abuse! These cats hold up to extended anti-lag on race cars, so they'll hold up to anything! Specify exhaust tubing size. This is a 100 cpi cat suitable for race cars.

These cats feature a 4" diameter round configuration and have the following features:

304 Stainless Steel case
Quicker "light off"
15%-30% Less pressure drop than a ceramic of the same size
Reduction of overall size
No matting required
Higher thermal shock resistance

Link: http://www.davesport.com/cgi-bin/davesport/DCAT100.html

Forum member swoope has runs this high-flow cat on his car and there is a discussion of it in this thread: http://www.rx8club.com/showthread.php?t=136242

If interested, please vote in the poll and send a pm to forum member Mr. Pockets who's communicating with Dave @ Davesport.

P.S. From the Davesport website, the price listed for this cat is $138.

Also, for those that might be wondering, this cat could be paired with a pre-built catless midpipe, such as the one with 3" tubing that rx7store.net sells for $199 on their site (has a pre-welded O2 sensor bung):

http://www.rx7store.net/v/vspfiles/photos/RX8store%20Midpipe-2.jpg

Link: http://www.rx7store.net/product_p/rx8store%20midpipe.htm

To be honest, I can't provide any more detail than what Chike has very graciously posted. Thanks a lot, dude! :)

I, personally, will not be collecting any money. I just want a list of interested parties as a first step. I have no idea how long it will take Dave to place the order, receive the product and distribute it. I wouldn't assume it'll be any quicker than a few weeks.

I was the one that originally found this cat. I had sent off an email to them and this is the reply I received.

Hello Allen,

I've actually sold several to rotary guys. I unfortunately have no additional facts on the cats. The manufacturer doesn't provide them. I can tell you anecdotally that my rally customers are getting several seasons on them using full anti-lag, which also raises exhaust temperatures to ridiculous levels. The farther back you can place the cat the better though - both for flow and for longevity.

Best regards,
Dave LaTourette
Davesport, LLC
Street Race Off-Road
Vehicle Preparation and Tuning
www.davesport.com
ph. 425-888-4444
fax 425-888-6444

So far, Swoope is the only one that I know of that has tried this cat and he has had no problems so far. I found one of another brand real cheap, so I'm not using this one yet.

Al,

Thanks for your input. Hopefully swoope can add his $0.02 as well.

Good news!

Dave has ordered the cats. He should get them in the next 7-10 days. Feel free to place the order via the Davesport website. No need to PM me or take part in any sort of poll.

Cool. That's awesome news. I'll order mine tonight!

-Chike

I've used this cat on my FD, it has worked for a number of years but I don't drive the car all that much.

I'd be curious as to who is the original manufacture of these cats.

I'd be curious as to who is the original manufacture of these cats.

It looks a lot like the car-sound (Magnaflow) cat that we used on our RallyCross car.

Placed my order! Nick, thanks again for contacting Dave @ Davesport.

I'd be curious as to who is the original manufacture of these cats.

i think we all would! ;)

i almost want to order a back up, but mine is still going strong..

beers :beer:

I'd be curious as to who is the original manufacture of these cats.

i think we all would! ;)

i almost want to order a back up, but mine is still going strong..

beers :beer:
I did a lot of searching on the nets last night and came up with nothing. I think to find these, you would need to go SEMA or the other performance show in Indianapolis (I don't remember the name of). There is probably a small booth manned by one guy thats pushing these no-name cats.
On the nets, I found a lot of references to 100 cpi cats, but I couldn't put a name to them (in North America). Davesport is the only company I found that was actually selling them. Even finding the 200 cpi cats wasn't easy.

interesting. are my plans getting cheaper?

yep,

i saw some sites with silly stuff on them. issue is you dont know if that is the one, or is it going to last..


beers :beer:

I did a lot of searching on the nets last night and came up with nothing. I think to find these, you would need to go SEMA or the other performance show in Indianapolis (I don't remember the name of). There is probably a small booth manned by one guy thats pushing these no-name cats.
On the nets, I found a lot of references to 100 cpi cats, but I couldn't put a name to them (in North America). Davesport is the only company I found that was actually selling them. Even finding the 200 cpi cats wasn't easy.

I did a lot of searching on the nets last night and came up with nothing. I think to find these, you would need to go SEMA or the other performance show in Indianapolis (I don't remember the name of). There is probably a small booth manned by one guy thats pushing these no-name cats.
On the nets, I found a lot of references to 100 cpi cats, but I couldn't put a name to them (in North America). Davesport is the only company I found that was actually selling them. Even finding the 200 cpi cats wasn't easy.

You have to overlook overseas.

I have found plenty.

On my assumptions, if these were made in the USA there would be no hesitation to get these made becasue they could be quickly made and shipped.

They could be imported from either Europe/China/Japan and so forth.


This is from 20+ hours of searching and researching.

http://www.hjs-motorsport.de/english/produkte_kat.php

Looks a lot like a Vibrant cat.

http://vibrantperformance.com/catalog/index.php?cPath=1022_1035_1063_1111

http://www.hjs-motorsport.de/english/produkte_kat.php



one BILLION DOLLARS! :lol:

beers :beer:

Looks a lot like a Vibrant cat.

http://vibrantperformance.com/catalog/index.php?cPath=1022_1035_1063_1111

300 cel count.. not the same..

i did about another 50 laps on it tonight. ~ 1 hr of track time.

all second gear. but i do get just below the rev cut.

still going fine..

beers :beer:

Maybe this one? http://www.metalcat.com.au/

Maybe this one? http://www.metalcat.com.au/

that sure looks like it. now if we can just find out who makes it for them.. :)

beers :beer:

one BILLION DOLLARS! :lol:

beers :beer:

220 rwhp on a Mustang dyno too ....:hahano:

220 rwhp on a Mustang dyno too ....:hahano:

yea,

i am going to be working on that soon. with my low compression motor.. :(

i love your hand me downs.. could you run some bilstien coilovers soon? :)

beers :beer:

I have an engine .. ;)

I have an engine .. ;)

yea,

i think i have two of them. and a spare tranny.. need a dif. i am you guy.

koni challange series racing tires. lots of them. man my garage is full..

have you seen the im on a boat? (http://www.youtube.com/watch?v=R7yfISlGLNU)

it will take you mind of the leftover stuff. kane got me hooked on laughing again..

:beers:beer:

I sell these racecats.

Most of the STU cars at nats bought their cats from me. My customers won 8 trophies in STU, and 2 in STX, including the STX ProSolo Champ and the #1 & 2 STU car. :yesnod:

Rick

Nice to see you on here Rick. If I ever need a replacement, I'll hit you up.

P.S. I can personally vouch for Rick. Great guy, who can be trusted.

I sell these racecats.

Most of the STU cars at nats bought their cats from me. My customers won 8 trophies in STU, and 2 in STX, including the STX ProSolo Champ and the #1 & 2 STU car. :yesnod:

Rick

really,

it would be cool if you drop me a pm

beers :beer:

http://www.hjs-motorsport.de/english/produkte_kat.php


usa distributor

http://www.hjs-motorsport.de/english/bezugsquellen.php#

usa distributor

http://www.hjs-motorsport.de/english/bezugsquellen.php#

funny,

i called billy boat a couple of years ago about this.. i got a huge cup of duh! really.

beers :beer:

That's because they're not, the BB listing was old and not valid back when I bought my first one in 2006. I've imported all mine from Germany. I probably have more $$$ in my exhaust than most people have in mods for the entire car. Me is stoooooopid .... :Freak_ani

OK, so TeamRX8. You know I am making the dual catback. It is almost done. I want to offer these cats. But I need to make sure that the cel light will not trip and that the car will pass smog test since I'm out here in cali. Are these 100cpi cats good for that. Remember that each rotor will have it's own cat.

I was also going to place the 02 sensors in the rear rotor exhaust pipe.

P.S. The racing beat header flange is very nice to build upon.

Nice to see you on here Rick. If I ever need a replacement, I'll hit you up.

P.S. I can personally vouch for Rick. Great guy, who can be trusted.

Thanks Chiketkd,

If anyone still wants one, I now have some of the 100cpi cats in stock. SS spun housing, made in the US, exactly the same as the one in the original pic. I have both 3" and 2.5" i/o. This will be my last batch.

Rick

dual HJS cats?

Good luck selling that .....

Yeah, I know, but since it will be true dual I will need an option for dual cats or I can run a cross pipe for one cat, but then it wont be dual anymore. As for the header it has a ss flange going into the siamese port

I thought the 100 cpi cats would work just fine, they are also affordable

Anyways, I have to do a few more vmount installs before I can finish my rx8 project stuff.

HJS cats are everything except affordable.

If you want affordable you need the thread topic product.

That's because they're not, the BB listing was old and not valid back when I bought my first one in 2006. I've imported all mine from Germany. I probably have more $$$ in my exhaust than most people have in mods for the entire car. Me is stoooooopid .... :Freak_ani

bingo! nor was it likely ever..

beers :beer:

Will this cat pass California emissions test? Also, swoope, are you saying this cat lasts longer than the OEM cat?

Will this cat pass California emissions test? Also, swoope, are you saying this cat lasts longer than the OEM cat?

They're not EPA certified, I doubt any 100cpi is. As far as smog tests, some cars pass, some don't, depends on the tune. The cats seem to last, as long as the car is not run super rich, which causes excessive heat via the catalytic reaction.

They're not EPA certified, I doubt any 100cpi is. As far as smog tests, some cars pass, some don't, depends on the tune. The cats seem to last, as long as the car is not run super rich, which causes excessive heat via the catalytic reaction.
Rick,

Do you sell any 200cpi or 300cpi cats? I need to switch to something a little more restrictive this winter. My 100cpi Davesport cat keeps throwing a code for cat efficiency every 3-4 weeks.

-Chike

That kind of sucks, Chike. I'm on my second season with my Davesport cat and I've had no problems with it. No codes. Honestly, even if it wore out and started giving me DTCs, I'd just buy another one. They're cheap enough to replace every couple years.

^Agreed. No big deal for me though as I'm only doing local stuff this season. I'll figure out what cat my car needs this Winter, get her tuned and step things up another notch next season! :cool:

Rick,

Do you sell any 200cpi or 300cpi cats? I need to switch to something a little more restrictive this winter. My 100cpi Davesport cat keeps throwing a code for cat efficiency every 3-4 weeks.

-Chike

odd,

as mine is still going stong, and it is sitting or on track!!! no daily driver anymore.

beers :beer:

odd,

as mine is still going stong, and it is sitting or on track!!! no daily driver anymore.

beers :beer:
My cat is still working just fine - I took the pipe off and inspected it to be sure. I just think the later model year RX-8's might have a more sensitive emissions monitoring system.

Hopefully a 200cpi metal core cat will be the trick. If not I'll go to a 300cpi cat like Isley used on his car.

Just bought one!
It will be on the car soon: I'll post results

I opted for the combo high flow cat welded to a 3" race pipe from RX7store. It just seemed easier to me since I don't weld. I plan on installing myself. Otherwisee this looks like a great deal. I wll consider this option the next time my cat shits out on me..

Sooo, I hope I spell it right. I got to ride in a gumpart-apollo. Guess what, twin turbo audi v8. The turbos and wastegates dump straight into the cats. The car has twin HJS 200 cpi cats, one for each bank. They also said pricing is around 700 for each. I may have to rework the exhaust system design to use these because these cats should do fine with the exhaust heat from the rotary.

Sooo, I hope I spell it right. I got to ride in a gumpart-apollo. Guess what, twin turbo audi v8. The turbos and wastegates dump straight into the cats. The car has twin HJS 200 cpi cats, one for each bank. They also said pricing is around 700 for each. I may have to rework the exhaust system design to use these because these cats should do fine with the exhaust heat from the rotary.

wow,

have you really read this thread?

beers :beer:

Mine was just installed before the summer and I just put 800 track miles on it this past weekend. With about 4000 miles on the road. No problems so far with the cat.

wow,

have you really read this thread?

beers :beer:


Yes ofcourse I have read this thread. Why, what was wrong with what I posted? I am just posting on the HJS cats that teamrx8 was referring to, that they are also used in a cool twin turbo application.

anything else?

Yes ofcourse I have read this thread. Why, what was wrong with what I posted? I am just posting on the HJS cats that teamrx8 was referring to, that they are also used in a cool twin turbo application.

anything else?

so you are bumping stuff not available in the usa or are you going to provide it?

and the cost is the issue.. 200 > 100. not in a good way.

bees :beer:

1. sorry to post something off topic and bump this thread.
2. If it is still made, anyone can get it even if its in another country.
3. cost is not an issue to some people.

When you say provide, do you mean HJS cats or Davesport cats?

Can't we all just get along?

How does this sound and now that BHR is offering it on there midpipe it must be interesting.

Sorry to raise the dead here but what options did everyone go with to mount this up?

That BHR offering looks pretty tempting (with a resonator even) http://blackhaloracing.com/products-page/bhr-products/bhr-resonated-midpipe/

But I wanted to see what else everyone chose?

Thanks for the input.

For 450 Bucks I could make 3 of them...Just get some piping, a 40$ Vibrant performance resonator. and the Davesport CAT...It won't look as pretty, but it will do the exact same thing...

For 450 Bucks I could make 3 of them...Just get some piping, a 40$ Vibrant performance resonator. and the Davesport CAT...It won't look as pretty, but it will do the exact same thing...

Yes and no. The BHR resonator is not the vibrant unit they started with. The vibrant was failing so BHR found a different company who is making a custom resonator.

Which will only effect sound...Not performance...


:dunno:

and the fact that the Vibrant resonator can't handle the EGT's and will literally start tearing itself apart into your mufflers.
aside from that little detail... :uhh:

Sorry to raise the dead here but what options did everyone go with to mount this up?

That BHR offering looks pretty tempting (with a resonator even) http://blackhaloracing.com/products-page/bhr-products/bhr-resonated-midpipe/

But I wanted to see what else everyone chose?

Thanks for the input.

The cat is not included for $450. The cat is bumping the price $175 (a little step considering you can buy one from davesport for about $100). Add $100 for polishing and another $25 for a second o2 bung. Tops out at $750 which is a little pricy. Great quality, service and warrenty but still $750. I have the Turboxs exhaust kit and I had my local exhaust ship wield in the davesport cat. Total cost for exhaust, cat and wielding was about $700.

Only an idiot would waste $100 to polish a rotary mid/cat pipe.

and the fact that the Vibrant resonator can't handle the EGT's and will literally start tearing itself apart into your mufflers.
aside from that little detail... :uhh:
I took my midpipe off around the end of summer and my Vibrant resonator was still intact and not "tearing itself apart".

I guess YMMV on this one... :boink:

Your better off having a shop weld the cat to existing system and removing the CAT back

Allow me to explain;

1) We tried the same Vibrant resonator that everyone else uses for their cheap midpipes. Raspy sound and poor longevity because the interior packing burns away (they were not designed for use with rotary engines). The detrimental effects when this happens have been provided by our good friend, TeamRX8 with a link. Perhaps he will be so kind as to repost it here for everyone to learn about exhaust flow and what happens when devices designed to use packing no longer have the packing to attenuate certain frequency groupings...... :dunno:

2) We then tried the Moroso 94055 Race muffler. Although it has no interior packing, it also failed because Moroso took a patented design, reverse-engineered it, and used thinner gauge steel with shitty welds. The Renesis tore those things apart in 30 days of use.

3) We were then directed by a friend to the guy who holds the patent for the muffler/resonator and the rest of the story is posted on our website.

As for the DaveSport cats costing "only $100"; that is not what they are priced at on Dave's website. I buy them 6-8 at a time for more than that and at a discount that hardly makes offering them on our midpipes worth the hassle for me.

It's cheap, but you get what you pay for. 100 CPI is only part of the equation. The OD is considerably smaller than the OE cat. So it gains some flow area with 100 cpi but also gives some up with a lower total cross sectional area. I've never seen any temp data on it, but I suspect it can't take the heat long term.

The stainless mesh packing in my Coast Fab mufflers will never wear out. Ever.

As for the DaveSport cats costing "only $100"; that is not what they are priced at on Dave's website. I buy them 6-8 at a time for more than that and at a discount that hardly makes offering them on our midpipes worth the hassle for me.


I apologize I was incorrect on the price of the davesport cat. I think I paid about $120 plus shipping maybe $135 but that was over a year ago. Website price is about $138 (plus shipping) now.

FTR I think charging $175 for the cat is fair. You do need to make a profit to cover the extra work required for the install and for the buyer it would cost more to have it welded in. Win win for everyone.

FTR I think charging $175 for the cat is fair. You do need to make a profit to cover the extra work required for the install and for the buyer it would cost more to have it welded in. Win win for everyone.

At $175, BHR makes nothing after all is said and done because the DaveSport cat (although listed as a 3" inlet/outlet) actually turns out to be a bit bigger than that and a little pipe-strecthing becomes necessary. Another "value-add" on the midpipe. I am just glad offering the cat does not have to go the same way the fuel pump removal loaner tools did.

The reason I wanted the actual cost of the cat to be clarified is because people will always contact me bitching about the price we charge for stuff, and their complaints are often based on erroneous information. Then, we retailers get accused of charging too much.

It's cheap, but you get what you pay for. 100 CPI is only part of the equation. The OD is considerably smaller than the OE cat. So it gains some flow area with 100 cpi but also gives some up with a lower total cross sectional area. I've never seen any temp data on it, but I suspect it can't take the heat long term.

Given that my front O2 sensor has been faulty for a few months and subjecting my own DaveSport cat to random max-rich situations, I am pretty sure when I next check the condition of the cat it will be all we need to say about whether or not the DaveSport works well on the Renesis. Especially since I have it mounted in the front half of the midpipe just before the first bend. I just re-installed my factory flash the other day and the 420 CEL still does not illuminate. N/A applications I think will be fine, and maybe street F/I'd applications, but heavily tracked/seriously boosted engines we haven't gathered any info/data about yet.

Of course, serious trackers can always use the HJS cat.

Ooooooooh-yeaaaaaah

http://www.reinaldoguerra.com/wp-content/uploads/2008/04/kool-aid-man.gif

I am always flattered by your obsession, Team.

:beer: ahh...

I am always flattered by your obsession, Team.

As I, yours :)

It seems that this is the only option to replacing the OEM cat. The RP super cats are dying within 10k.
What kind of longevity are you seeing with these cat's? Also it seems some people are getting P0420 codes is this true or is that because of other problems?

I was thinking of getting the BHR midpipe with the davesport cat to replace my bad OEM cat. At least with this setup the cat is cheap and can be cut out and replaced when it goes bad. $625 with the option to replace the cat for $138 plus welding seems better then spending $1100 for the OEM that seems to die on me every 40k. Unless it just comes out to a wash with lower longevity.

edit i also just found the rx7store replacement that apparently uses the davesport, only $345. apprently swoope has had this one on his car since 2006 with no problems. That might be my answer.

it's not the only option, there is the Magnaflow option (new and unknown) or the HKS racing cat option ($$$ but proven and ultimate flow potential)

If I remember correctly, the Magnaflow isn't a 100cpi cat and it can't handle the temps of the rotary. Your HKS may be a might fine and long lasting cat, but the price is just too high for most to justify.

if you had remembered correctly you would know to get your facts straight first

100 cpi means nothing in and of itself other than there are 100 holes every square inch, not their size, flow potential, total area, etc.

the Magnaflow is not a generic cat, it is a certified 49 state legal cat pipe replacement, and be advised that there is potential for STX to be revised in 2011 to meet this requirement which leaves you with this option or OE only that I'm aware of

http://www.magnaflow.com/02catalytic_converters/02product/displaydirectfit.asp?directfit=49150

Otherwise I simply stated that the HKS cat is a proven option. I not recommending it and could care less about anyone elses no-experience-using-it opinion or financial capability ...

I was looking for equal or better performance, a better value then the OEM, and no CELs. We all know that performance exhaust systems for the rx8 don't really add up to much. Especially on NA systems

So the HKS doesn't work for me because of the value. The magnaflow doesn't look like it works at all. The RP supercat looks like it has terrible value because it only lasts about 10k. That only leaves the davesport with the rx7store, bhr midpipe, or weld it into the existing exhaust.
I'm leaning toward the bhr because it seems it is of better quality. The resonator sounds like its worth the money too. If it lasts more then 20k it would be a better value then going with the OEM which costs $1100 plus labor to weld it on. I could get the bolt on midpipe plus an extra davesport cat for equal or less then the cost of OEM!

I hope my reasoning is somewhat sound. Thanks for the help and information.

Edit: apparently the rx7store comes with the magnaflow cat not the davesport. I also have an email out to SRmotorsport to see who manufacters there hi flow cat. I did not know that SR was another option

Second edit: SRmotorsports uses the magnaflow catalytic converter.

I had the Magnaflow cat (which afaik is what comes on the rx7store pipe w/ cat) which died for me pretty much immediately (< 200 miles) after going turbo. It lasted a total of maybe 1500-2000 miles. At the end of its life it was giving me approximately a 60-70g/s flow reduction on my peak airflow numbers vs a test pipe as well as reducing my manifold pressures by about 3psi from 5000RPM+. I posted pictures of it after dying in my build thread here (http://www.rx8club.com/showthread.php?t=204325).

It did not give me a CEL while NA on the stock tune.

After doing my research I decided to add a little back to the community. Here is a thread that has a compiled list of all cats and cat included midpipes

http://www.rx8club.com/showthread.php?p=3847125#post3847125

I still have the Davesport cat, but I usually take it out for the winter. First, my midpipe (with no resonator) is loud. Second, the cat doesn't work well on the car in the winter. During the warmer months I have no problem with codes. When it's colder I get a cat efficiency code some times.

If you live in a warm climate, the Davesport cat could probably work for you just fine year-round. But if it gets into the 30s, you're going to see a CE light some times.

I don't know how many miles I have on mine, but after two summers it's not a huge number. I don't drive a whole lot. My commute almost doesn't register on the odometer. At most I have about 5k on the thing. If it stopped working, I'd get another.

Mark, I hadn't heard about that proposed rule change. Interesting. I don't think I'll be in STX much longer, though.

^Different car or going to a different class with it?

You caught that quickly. :)

I think I'm going to be driving a different car this season. I won't muck up this thread any further with the story.

Suffice it to say the decision isn't because of the Davesport cat, which I am very happy with. :)

There's no proposed change other than the discussion about an ST re-org and the usual closed-minded complainers who think the ST rules should be identical throughout theentire cAtegory the same as all the other categories. Except they're not the same in all categories; Prepared and Modified. Just the same the bitchers and moaners seem to be getting all the consideration lately IMO. I don't see them opening up the rules in all the ST classes given a number of the latest rulings for that category. I doubt they will open up the cat rules for the lesser allowance classes. If anything they'll do another takeback or leave it alone. Another takeback wouldn't surprise me at all. That's why 2011 will likely be my last year in ST.

First, my midpipe (with no resonator) is loud..
which midpipe are you running? Also, what catback?

I had the Magnaflow cat (which afaik is what comes on the rx7store pipe w/ cat) which died for me pretty much immediately (< 200 miles) after going turbo. It lasted a total of maybe 1500-2000 miles. At the end of its life it was giving me approximately a 60-70g/s flow reduction on my peak airflow numbers vs a test pipe as well as reducing my manifold pressures by about 3psi from 5000RPM+. I posted pictures of it after dying in my build thread here (http://www.rx8club.com/showthread.php?t=204325).

It did not give me a CEL while NA on the stock tune.




If it is EPA certified they are required to warranty it for many years/miles. It was never rated for turbo use. A cat converrter can be burnt up for many reasons. That doesn't mean there is anything wrong with the cat. The Davesport cat has been burnt up plenty on turbo apps. My personal recommentation for tirbo is the HJS cat. It has both the flow capacity and heat resistance a turbi requires. You can still burn it up with a bad tune too. That's just the reality of using a cat converter.

which midpipe are you running? Also, what catback?

I'm pretty sure the midpipe is form RX7Store. I have a Greddy SP2 catback. So far, I've been able to stay just under the sound limits at national autocross events.