Cut and drilled mine today whilst fitting new pads, well pleased with the free air feed upgrade, thanks Jim. One thing i noticed on mine though, is that the air feed channel doesnt go all the way through to the brakes, there is about 8" of gap. Apparently BMW sell the channels to complete the run. I will look into it on Monday.

Still dissapointed in the brakes, i cant help but think there is an issue with them somewhere as the pedal feels soft, almost like they have air in. Which of course they may, im going to investigate brakes a lot further very soon...