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THE EVIL TW1N · 04-01-2009, 12:55 PM

i doubt you'll get much at all from replacing the cats. On my supercharged cobra, the typical gain is 5-7 rwhp or so going from the stock 4 cat pipe to an off road x pipe. And 20 rwhp is very optimistic for the long tubes... Maybe on an LT1 with what looked like crush bent exhaust manifolds. It's probably closer to 10-12 rwhp.

04-01-2009, 12:55 PM	#23
THE EVIL TW1N Banned Drives: 2003 Cobra Convertible Join Date: Feb 2009 Location: CA Posts: 2,925	i doubt you'll get much at all from replacing the cats. On my supercharged cobra, the typical gain is 5-7 rwhp or so going from the stock 4 cat pipe to an off road x pipe. And 20 rwhp is very optimistic for the long tubes... Maybe on an LT1 with what looked like crush bent exhaust manifolds. It's probably closer to 10-12 rwhp. Last edited by THE EVIL TW1N; 04-01-2009 at 04:03 PM.