3D Design tuning house has released their new aero enhancements for the E89 Z4 which includes the polyurethane front lip and trunk spoiler, and a carbon fiber reinforced plastic rear diffuser.
Please refer to the price list below:
Front lip spoiler: $956
Trunk spoiler: $805
Rear diffuser: $1,260
Please see this sample of a car that has the front lip spoiler installed: