well not really any performance increase it does seem like it spools up quicker /ubbthreads/images/graemlins/shrug.gif /ubbthreads/images/graemlins/shrug.gif. most people do it for the whistle of the turbo . it is alot louder /ubbthreads/images/graemlins/smokin.gif. yes i love it here in TN. it is a great place to live.