Yea the BMW m3 V8 Would be nice too, but thats just not enough rpms for me lol.

While (if you can put the power down) the M3 motor would be a bit faster in a straight line, I believe it would be a lot harder to control. Whereas the Busa V8 would still have incredible power, it would be a lot easier to put down because all of the torque would be very high in the powerband!

I couldn't imagine what the top-end would be like with the busa-frank motor! And the gearing will more than make-up for the low-end (I.E. F1 cars)