[8500lbs]

i did the borla cat back and i have been very pleased with them. they are very mellow at highway speed and low rpm but when i get on it they do come to life. I also have dynatech headers and high flow cats, volant air box, air aid intake tube, throttle body spacer, and superchips programmer. so as far as performance I cant tell ya what just the borla will do. If you want HP though i am looking at selling the superchips programmer and getting the Predator Motorsports CPU. it dyno's a gain of 64HP and 79 foot pounds. that is the best i have seen with out going forced induction.