I've built two variations of the upcoming rereleased M5/5 series by Fujimi. Sad that the new one isn't being done...yet. I have a diecast late model 5 series that I intend to do the body conversion on. I have no clue how to do the wheels though.
M5 South Carolina State Patrol car (behind the GA State Patrol BMW that was used during/after the '96 Olympics)
The M5 was a real patrol car, I caught pics of it after he had apprehended a fleeing motorcycle rider! He loved the car, wrecked it after several years.
The Fujimi 535:
They're decent curbsides, typical Fujimi.