i autocross my ef in stock, so i can only do shocks, race tires and cat-back. i was thinkin of doing an exhaust mainly because my car (stock exhaust) is too quiet. i like to be able to hear it with my helmet on and i can't. but i figure if i'm gonna do an exhaust, i should try to get some performance out of it. is it worth it to do an exhaust ONLY? am i gonna het anything out of it or will it actually hurt me (loss of low end)?