[jadnashuanh]

I don't think the brakes are different with the sport package...at least the spec page on the BMW website doesn't say that it differs between the stock vehicle and the sport optioned one. So, depending on the wheel (and an aftermarket 18" wheel might NOT fit, whereas an 18" BMW wheel might), you could probably install 18" wheels. You might look for someone with takeoff 18", and get a good deal on a set of wheels and TPMS. I don't have a sport option, but 18" aftermarket wheels fit fine.

The stock wheel on the 550 is the same as on the 535, although I was wrong about the brakes, they're bigger on the V-8 verses the I-6, but the stock wheels are the same 18x8. Still can't find a difference in brakes on the sport model.