The swept area for the Brembo pad is around 52mm, the oem M3 rotors are about 64mm. Those brakes are going to look odd with a 1/2" rusty ridge around them.
If anyone doesn't want to drop the cash into a full Brembo kit, why don't you look into the oem Brembo/rotor setup that's fitted as an option to the new model 335
370mm rotors and 4 pot calipers
Here are the numbers and details
Still a single slider on the rear caliper
