gmmg exhaust gain 
high flow cat horse power increase ?
Yes since some of you are not familar with them not all cats are the same. Earlier ones you could knock the guts out of them. Newer metallic honeycomb cats you can not. And if they are clogged up and got almost 200,000 miles on them then yes you will notice a difference.
I agree completely. I don't have any cats on my stock y at the moment. I have a hooker 3" ory waiting to go on though.
TECH Senior Member
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From: Decatur, TN (N-W of Athens)
Yes since some of you are not familar with them not all cats are the same. Earlier ones you could knock the guts out of them. Newer metallic honeycomb cats you can not. And if they are clogged up and got almost 200,000 miles on them then yes you will notice a difference.
Teching In
Joined: Oct 2014
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I have a 96 ws6 cut out cat , welded in straight pipe got 9 hp dynode right after work was done. We took the California air emissions box off plugged all holes this was our original goal/test on hp. it was 4. So then we decided to do cats and reran the dyno. Just my 5 cents worth but my advice take the cats off if you live in a state that don't check emissions , free hp. Im not sure on ls1 or the newer models mine is almost 20.
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Mines a mostly stock LT-1 and I removed my cat as well...while I didn't get on a dyno, I did notice an increased throttle response, and a much better exhaust note....also removed about 20lbs between the cat itself and the accompanying brackets & bolts.
Teching In
Joined: Apr 2016
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I had mine removed, they were reaching temperatures of about 700 degrees. It definitely made my 97 trans am run better but now I'm getting a service engine light with the code 0430 catalytic converter system. Dose not effect my performance any but I was wondering if there's a way to keep the light from coming on? Guessing it's just part of the pcm and I'll just have to live with it.
Teching In
Joined: Apr 2016
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Does anyone know if you can get away with having a single cat on a 96 Camaro. I know they come stock with 2 cats but was wondering if i could put one cat where the 2 separate pipes on a pacesetter y-pipe come together? Any thoughts or other ways i can still get away with having one cat?
Does anyone know if you can get away with having a single cat on a 96 Camaro. I know they come stock with 2 cats but was wondering if i could put one cat where the 2 separate pipes on a pacesetter y-pipe come together? Any thoughts or other ways i can still get away with having one cat?
