skelters said:Obviously this is all a load of b*****ks as the only true performance upgrade is changing a whippy to a stubby due to the increased aerodynamic performance at the rear of the Z4. The extra downforce generated is then converted into grip on the road which allows the engine to propel the car forward at lightning speed.
Don't forget the extra downforce created by the coupe's bird bath, equalling roughly one extra lightning of speed.