It's also a good idea to bleed your brakes after each Track event...
I also ran Motul RBF600 in my AP Racing BBK on my G35 & had no problems.
Hege.... I assume AP Racing doesn't make a kit for the e90/93,93, since I haven't seen anyone comment on them. If they do, they would be worth considering.
Track Video with AP Racing BBK Out Braking a Modified C6 Corvette: