Also, I think, though you have to ask Greg or Tony, but the P2R bumps you to STX from stock (FA5) if you're not already with the stock LSD (still in question). I know for a fact that you will be bumped out of the stock classes to SM class if you do anything past the throttle body. That's all I know though
That's where we get spanked by EVOs and STIs. But I'm still gonna do it, maybe lower the reflash... sorry about the threadjack!