Originally Posted by surlynkid
i would say that it will do very little. it looks nice with no tire, but put a tire in the way, and you will get negligible airflow to the vanes of the rotor where it is needed.
I measured it up and the wheel well port is inboard of a 9.5" wheel with a 275 tire that is offset right up to the strut. Getting fresh air into the wheel well must help some...it's been standard on M's up until the E90.