Originally Posted by TTO898
Great write-up, thanks. I have a new E93 that I've been contemplating doing this on and not sure if I should actually do it or not. The highway drone scares me a bit, I must say.
Trust me there is absolutely zero drone with the OEM mod. OP is the only person I heard of to report any drone with this mod. It sound probably 90% the same inside the cabin with only an increase in volume when you really get on it. Cruising on the highway it will sound the same as stock, no drone at all. The real increase in volume is on the outside of the car.
Thats the beauty of this mod. Outside it is much louder than stock and sounds aggressive but inside it sounds almost exactly the same.