Dude, whatever you add, pleasepleasepleasepleaseprettyplease DO NOT add one of those infernal, wretched, 5-inch exhaust outlet fart-pipe things. They are insufferably stooooooopid! Look and sound like utter crap and don't gain u any power anyway; if I may suggest, save your pennies and upgrade the engine (IE: turbo kit/NOx), chassis, and suspension. Then--very important!--learn how to DRIVE it!