I hope the M version of the Z4 has the 333hp 3.2L I6. The Z4 3.0i already does 0-60 in 5.9 seconds (which is faster than the other 3.0 liter BMW's) due to the lighter weight and probably better aerodynamics. If you cram a 400hp V8 under the hood, the M Z4 will just be a tail-happy timebomb waiting to "explode" on public streets. I feel the 3.2L I6 motor would be perfect for the M version of the Z4 - superb acceleration without being too fast for the suspension. And at the very least, I'd rather have the sweet-sounding I6 motor as opposed to a deep V8 rumble in the little Z4 roadster.
