They haven't posted the specs, but it looks like a car made for people who wear helmets. Changes include aluminum accessories inside, along with Recaro racing buckets with 6-point harnesses. Outside, larger, slotted discs -- the rears perhaps fed by intakes behind the sills -- a roll cage, and some serious engine bay stiffening complement the aero add-ons. Hamann's last Z4 M workover only upped the horsepower by a paltry fifteen. We would hope they haven't made the same mistake this time.