I have an M-sport 335i. I have been trying to confirm if the springs are different in the sport and the M-sport versions. My front springs are "D6" and the rears are "D3". Are yours the same? I have heard that the rear springs were upgraded to linear type springs by BMW on cars built after Nov 2010. My car was built in May 2010.
I just ordered Dinan camber plates and Koni FSD shocks and will be isntalling them over the weekend. I would like to update the rear springs.