Will i see an increase in HP going to full 2 1/2 inch exhaust?

aj1025 said:

I currently have a 2 1/2 inch off road h-pipe exhaust from the exhaust manifolds to the mufflers, and the exhaust from the mufflers to the tailpipes is all factory 2 1/4 inch exhaust. My question is if I get a full cat-back exhaust that would make all of my exhaust 2 1/2 inches including new mufflers will i see a real HP gain, because these catback exhaust kits aren't cheap, I just don't want to waste the money. And also what do you think is the best catback that's 2 1/2 inches, I 'm leaning towards Borla, but steer me in another direction if i'm wrong.

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aj1025 said:

Hey thanks for the replys, yeah i would really like the Bassani exhaust, but ouch, man that's going to cost me out the waazu, what about the flowmaster or mac catbacks, any op. on these.I'm going to see a friend of mine this weekend who lives out of town and he just installed magnaflows on his gt which are dumped, i can't wait to hear his setup, i just might go with that but will it cause a drop in HP?

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