Disc brake cooling, anyone done any ducts, scoops or....?

Best bet would be a chin spoiler with like Howe ducts on it . A lot of my buddies race bmw and they all got them . The only prob is when street driving they will stay to cool and not work properly . So making ducts with removable covers would be a good idea . Wanna go race pull them off , cruising keep them on . Mine are for a snorkle intake but same idea . And terrible pics I know lol . Hope this helps