Noob here...

I need to know what kind of RWHP gains I can get with an 2.5" H-pipe, 2.5" Cat-back Exhaust, CAI all MAC and a Hypertech Programmer III.

Tried the same post in the 4.6 forum with not much luck. I just want to see if it's worth doing over having the neighbors whine and cops following me all over.

 

A full exhuast is one of the best bangs for the buck you can do with a stock or near stock car.