I have an rs also 1st thing check if you have a rear sway bar, i didnt lol.... it helps to have one.... my stag is my daily so wanted it to be sensible so far ive got a nistune, 3in hks exhaust, cooler, coils packs and hifow turbo so got around 234kw@rear.... and now i need a shift kit :-/ so save $$ cos what ever you do will cost ya...