I know the turbo, intercooler,exhaust, ecu, are all different, but what about the pistons, block, heads, crankshaft. It seems the STI would come with special forged pistons , forged crank, bigger valves, heavy duty piston rods, ect, any input.? Just wondering because of all the STI mods you all do on your XT's. Hey I,m a old Chevy Guy, forgive me.! I do own a 05 XT and find this all interesting. :?