Agree. Although I tend to think that the drone was not caused by the OEM mids , but of the combination with 1M quad muffler, as the 135i N54 never had any drone.
Was considering sticking the OEM mids back on to reduce some of the drone caused by the Meisterschaft axle back.
COBB tune . ETS FMIC . aFe CAI . Meisterschaft GT exhaust . Custom Midpipes . CDV . BM OCC . H&R springs :