I get my M5 delivered in early July. Does anyone know if the after market brake dust shields adversly affect the cooling of the brake rotors. My wife has a 328i convertible and the wheels look like the devil after about 30 miles due to the brake dust.
I would imagine they affect brake cooling somewhat. I wouldn't trade looks/convienence for the possible decreased safety.
Try waxing your rims. It's a pain, but it works. I've used Zymol combination cleaner/wax on mine three times, over the course of about six months, and the brake dust sticks to them a lot less, as a coat of wax is built up.
The E39 M5 rims don't look too bad with dust on them -- they only look really bad when you have a lot of dust built up, and they get wet and leave little runny marks through the dust.