Ancient thread revival...has anyone ever tried removing the sound insulation panels numbered 3 and 6 in the diagram below? If so, how much effort was involved? I've been desiring more engine/induction (not exhaust) sound in the cabin, and removal of these may provide a bit of increase.
http://www.realoem.com/bmw/enUS/showparts?id=VA93-USA---E90-BMW-M3&diagId=51_5851