I can tell you right now that with the 275s in back, you will need the M5 fender liners (around $275 installed for both) as well as your fenders rolled. The fender rolling is best done by a pro using the Haweka tool. I've had the fender liners done and am waiting for the Haaweka, which I hope will do the trick. My car is a 2001 540iA sport. The up side is that the wheels look great with the wider rear ones contrasting with the narrower fronts. It may be that without the sport suspension only the fender liner change is required, as a couple of people have said but I would plan on both if you want 275s in back.