HP gain with h-pipe

[crazystang05]

what's the HP gain with a catted hpipe and a gain with a non catted H-pipe and then how much more hp will you get with a cat abck system thanks

 

[pdl2flr]

Can't say for sure because I did not do a before/after dyno. But my car dynoed 237/278 with my MRT catted H-pipe as the only performance mod at the time. The dyno tech stated that the stock GT's he has dynoed are usually somewhere in the 220's. Based on that I probably gained around 10hp with the pipe.