Quote:
Originally Posted by flzrider
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This looks pretty cool but I don't think it would work as well in the 1M. I say this because the F30 (E90 too and I believe non-M E87) has built in air ducts that bring air from the bumper to the trailing edge of the undertray. Though not connected to the backing plates these ducts do direct air toward the brakes. The 1M has no such provision.
This does bring up the possibility of using the F30 backing plates and brake ducts through the undertray as Neil showed and leaving a gap as the factory does. Not as effective for track usage but very streetable.