Looking to add a cat to my recently acquired FD which is currently on a single turbo setup, resonated midpipe, and fairly loud exhaust. Goals are to:

1) get rid of the smell, and
2) quiet the thing down a bit (yes I will swap exhaust as well).

No smog test to pass, but trying to keep the car less conspicuous so as to attract less unwanted attention.

Scouring all the other high flow cat posts, it seems like all the recommendations are no longer with us.

- Bönez / rx7.com is still up, but has been unresponsive for a year
- Vibrant and MBS no longer have cats in their catalogues
- SMB and rx7store are gone
- SakeBomb: Want, but product never materialized

What does that leave us with?

- Magnaflow: ceramic, lots of failure reports
- RE-Amemiya: pain to get, not very durable, C$1400
- HJS: About C$2000 for just the cat, and doesn't support the air pump
- FEED: Nearly C$4000 from Japan
- random universal fit junk that probably won't stand up to our EGTs

Which options am I missing?
I'd even consider used at this point but the classifieds are littered with the same wanted posts.
Open to bolt-on options or just weld a cat or two on the midpipe.

 

SMB is still around but only through Marcus Read on FB, I confirmed with him, but they're not doing cats anymore, just the downpipe, resonated mid and catback.
He's working on a new catted option but it's not ready yet.

You can always have one custome made, I had this done before, just got a regular cheap midpipe, a metallic cat and resonator and took them to an exhaust shop to get fabbed.

 

You have more than a few options still available to date. Here are few options thru Rhd Japan.



https://www.rhdjapan.com/re-amemiya-...yzer-fd3s.html

This is the one I run on my single turbo car. They make two versions. With / without the air pump. It takes the rasp out along with reducing the smell. A air pump will also help a lot if you still utilize one.

Gp makes a similar one for a reduced cost

https://www.rhdjapan.com/gp-sports-e...d3s-kouki.html


If you spend some time searching their site you will find a few catbacks as well. Here is an example.
https://www.rhdjapan.com/re-amemiya-...-fd3s-13b.html


Also some combo options.
https://www.rhdjapan.com/re-amemiya-...0sub-fd3s.html


~ GW

 

Sard has a nice looking high flow cat, about $1K usd right now from nengun or one of the other Japan based stores. Has an air pump hookup also.

 

Surely there is at least one manufacturer or supplier of stainless low cell count catylists is North America?

 

G-sport by Gesi:

https://www.aceraceparts.com/collect...3j0DrfAvjA1SXu

Their non epa compliant Cats are pretty affordable and they are really high quality.

 

Save you scrolling as I was curious.

https://www.aceraceparts.com/collect...300-cpsi-10030

 

Amazing, thanks for all the leads.

I messaged Marcus and he doesn't have anything at the moment as everyone wants a cat-delete apparently.

Not sure how I missed these; thanks!

Great find. Keeping this one in mind.

 

Wow, that sucks. SMB and Bonez were great.

Petti has the cat below but the description does not inspire confidence... "standard grade", "direct fit", "interchanges with OE parts"
Makes me think the piping is 2.5" like stock. Might be worth a call to confirm.
https://pettitracing.com/products/ma...ytic-converter

Beyond that, maybe find a resonated mid pipe and buy the cat that Billy and Slides posted and have a shop weld it in before the resonator / muffler like SMB used to do.

 

I'm currently running a GESI G-Sport UHO 300 cell cat that was welded into a midpipe. No air pump. Unfortunately, I don't get to drive my car too often these days and only have about 500 miles since installing it in 2023. I can't comment on how well it will hold up with more miles.

Smell: I'm running FC-Tweak on PFC with the tune to reduce idle exhaust smell. It does get rid of a lot of the smell when fully warm, but not completely.

Sound: The midpipe was previously installed without the cat, then after with the cat welded in and it did not make a difference in sound to my ears. You may need to add an additional resonator if you want a more drastic noise reduction. Overall, it's a relatively quiet setup because I'm still on stock twins and have the older (more robust?) RB dual tip exhaust.

 

Thanks for the review on this one! I'll be tuning it with my recently acquired PFC Master, so I assume I can get similar results. I am okay with "most" of the smell gone -- I just don't want to be waving a giant "please pull me over" flag. RB exhaust is exactly what I am looking at as well. Do you have a sound clip video of how it sounds somewhere by chance?

 

Pettit Racing still shows a 3 inch hi-flow cat. It uses a Magnaflow cat now.

 

Can any catalyzer cell actually stand up to a tuned rotary on the track?

 

I would say if any could , it would be the stainless substrate of the Gesi. They are pretty stout.

 

I wonder if doubling up on cells like FEED would half the heat and unburnt fuel that each cat is exposed to, or if that's oversimplified thinking...

 

I would think that running two would dissapate and share the heat and flow between two cats. Personally, I would try a 850hp single Gesi cat since factory FD cats are in the middle of the car, far away from the turbo.

 

Obviously, the 2 cats would have to be installed in parallel to accomplish what you are saying. So one could use 2 smaller ID ones and get sufficient flow capability.

 

The Pettit/Magnaflow cat is ceramic, so I don't expect it would hold up to a single turbo setup. I wouldn't use it for anything other than a stock replacement or very light mods.

The Gesi 850 is my leading choice at the moment as it would seem more than capable of handling my setup, it's relatively affordable, and they sell replacement cores if it's ever needed.

Although the parallel setup of the FEED does look pretty.

 

the FEED/Desert Eagle converter is just like that. more surface area, should be less restrictive.

 

A single 4.5 ich core with cones each end will flow more than 2 3 inch cores in parallel.

 

That FEED setup sure looks like a nice piece. Isn’t it discontinued now?

too bad SBG didn’t move forward on their dual cat design.

 

No argument there, but the heat dissipation due to outside surface area would be smaller.

 

It does have the downside of basically doubling the cost of the cat.

I wonder what exactly is the difference between a “500 hp” cell and a “1000 hp” cell. Maybe just the length?

 

If the core is going to melt at high load that's absolutely meaningless compared to the exhaust flow temperature. The transfer ability from the centre of the core is absolutely meaningless.

That's like running a split tip on sn oxygen acetylene torch on two pieces of bread and saying the extra surface area will make a meaningful difference to the centre burning out.

 

OK, I stand corrected...