Hey all, right now I have an 07 GT 5 speed with just a flowmaster after cat. I'm not looking to do anything too radical for awhile since its my daily driver but I wanted a little more sound and a little more go. How much of a performance gain could I expect to get out of a tuner and what brand of x pipe would best be suited for my car. Do headers also wake these cars up or not really worth the money? Thanks for all the help!!