I have been a lucky one and played the game before it came out so ill let you guys in on a couple of things; compared to Forza 2 engines and drive lines are now separate upgrades, I bought a Nissan Silvia S13 (My car ) stuck an Rb26 in it and kept it RWD, almost all 4wd cars (nissan, subaru, mitsubishi) can have 4WD/RWD upgrades done to them, and most race cars can now be upgraded and all painted. If you are into serious/friendly drifting in forza head over to www.forzadrift.com and keep an eye out for comps or the forzamotorsport forums and look in the tournaments area, see you on Fujimi Kaido