I am soooooo tempted by this still. See the optional parts is that for it to run the best it possible can safely? Also I have a custom stainless dual exhaust (I think a copy of hks exhaust) having it supercharged would that type of exhaust be good enough or better off getting another? Also say I had it fitted with my original front bumper but later on decided for a change like a v2 bumper would there be many problems? thanks