yes. first off, the catback does nothing but make noise. you need to get a 3" catted down pipe for it to matter. secondly, the bov will olny make you run rich in between shifts. it does nothing but hurt the performance of the car. i would revert back to the stock bov and add a catted down pipe to the cat back exhaust. then i would get a Cobb access port andrun stage two with that.