I also did the extended warranty for an extra $20 mo and GAP and now I meet up with a fellow tC owner and come to find out he has a turbo installed on his car and selling off parts, I know he had a K&N Typhoon intake, either an MMW or AW header, Draxas s-pipe, ? midpipe, and a Greddy (SP2???) axelback. Would I be fine with replacing the OEM stuff with what he has from the s-pipe to the back? Doing those mods don't mess with much at all, well maybe the 2nd cat but I'm not in CA and don't expect to see the dealer at all(knocks on wood).