Has anybody done this on a e90/92/93?
"This raises the usual 250km/h governed top speed to 280km/h in the M3/M4 and 305km/h in the M5/M6, and can either be ordered with a new car or retrofitted. Owners of the previous generation BMW M3 (E92/93) and previous BMW X5/X6 M are also able to upgrade
http://www.iol.co.za/motoring/cars/bmw/unleashing-the-beast-in-our-long-term-m5-1977411"
"This raises the usual 250km/h governed top speed to 280km/h in the M3/M4 and 305km/h in the M5/M6, and can either be ordered with a new car or retrofitted. Owners of the previous generation BMW M3 (E92/93) and previous BMW X5/X6 M are also able to upgrade
http://www.iol.co.za/motoring/cars/bmw/unleashing-the-beast-in-our-long-term-m5-1977411"