Very interesting. Five years and 35k km later I am yet to hear this. I am about to install a BMC filter sometime today. Mine is a '07 car.
2007 E92 6MT - Silverstone II with /// Performance Exhaust with ACM Test Pipes and BPM Sport Stage II Dev-Tune - Proper engine warm up, 12-monthly oil change, Castrol TWS 10w-60
2014 F15 X5 3.0d