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Originally Posted by NJSPEEDER
a stock cat robs waaayyyyyy more than 2-3hp. jsut look at the results from ditching a cat, people pick up a full mph or more of trap speed without any tunign or anything. i picked up 1.5mph through teh traps in my 91 with no other changes.
with tuning the difference becomes even greater.
go !cat and don't look back. you will see an immediate and very noticeable power increase and improved fuel economy.
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An aftermarket true 3" in/out cat will make almost the same power as no cat. The stock cat is not 3" in/out and even the Random Tech cat is not a true 3" in/out. The muffler costs way more power than a cat. I put a true 3" cat on my old Pace Car with the Borla y-pipe and it made a noticeable difference. I would have never passed emissions without the cat on that car.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
Last edited by JL8Jeff; 12-23-2005 at 10:27 AM.
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