I would like to chime in on this post to offer my experience with dual resonator delete on the M240i. I can echo the general consensus from others on this - 10-15% louder inside the car, very close to stock sound levels in Comfort mode, Sport mode and up there are many enjoyable pops and crackles accompanied by a more pronounced exhaust tone. No drone whatsoever, I am extremely picky with tone and volume as this is my daily driven vehicle. +1 for the OP, the video posted helped me greatly with decision making.
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