Badass man, the P5 rear seats don't fit in the sedan but the fronts are the same. Don't think the leather skins will fit either because the P5 seats fold differently than the sedans.
I'm working it out the front skins are the same. The rear bottom is 2 separate pieces where the msp is one solid piece. I'm curious about the backs of the back seat though
if your going for over 200hp on stock block spend the money for a couple hour dyno tune session (unless your comfortable tuning). i would hate to see your motor go boom. maybe meth injection?