Any guesses on how much they'll sell it for? You can already buy the e60 M5 crate engine (S85) on realoem.com. The engine is $24k and the transmission is $9k. If someone really wanted a project, I suppose one could buy a 325i and some solid drivetrain parts, and stick it in there. You'd still be far less than the cost of buying an M5, and it'd most likely be faster.