I just put on a skunk 2 exhaust system this weekend and a short shifter...dood..i can feel some major gains in comparision to my tenzoR bolt on rear sect. exhaust. In the course of 2 months I've gotten an aem cai, skunk2 exh. sys. ...my si actully goes now wen i down shift...haha. What kind of headers should i get now? The throttle response in 5th gear is a whole lot better too..and i dont have to mash on the gas for it to be loud..its loud driving regularly now..Oh..the short shifter is ok..but takes getting used to.