The transmission receives a quick once-over and gets a shorter final drive. This, combined with the Z4's lower weight, guarantees mind blowing acceleration and excellent handling. Brakes are borrowed from the CSL track-ready version of the M3.
Exterior give-aways are the quad tailpipes and the lovely oversized M-style wheels.
It should be available in dealerships next spring.
2006 Z4 Roadster pricing:
3.0 $53,900
3.0 Si $60,900$
M $69,900