i havent added anything to my car really...i put in the intake, and i changed the springs, i had an exhaust shop put on the catback but i watched them when they did it so i guess it can vouch for something. Im headed to abacus in a week to order hondata s200 system im gonna let them install it and tune it becuase i know i will fuck something up. I would really like to do it myself, but i know professional people will be handling it and not some amateur kid like myself.