Hello Everyone, I have a 350 in my GS that is about 400 hp 400 tq. I was thinking of using long tube headers with a 2.5" exhaust system from TA Performance. My question is will the 2.5" be too big for the horse power I'll be running and is the T.A. exhaust system any good?
That's as near perfect size as you can get for your motor in terms of good low speed Torque and not killing off top end power, the key here is if the collector is 3 inch you want as long a neck down section as you can make to get that 1/2" reduction in tube size. This chart may help you feel good about your header pick.
2.5 exhaust with x pipe should be enough exhaust for your engine. I run a 2.5 with manifolds, magnaflo x system. Probably only 325 hp.