I just installed the BSW Stage 1 for my e90...
first from the beginning it was an overall easy experience. All speakers came very well packed. Nice and neat
. The install took about only an hour ( i do have a little experience with interior removal) ANYONE is capable of doing this install. These speakers are about as plug and play as it can get.. all speakers used stock screws an mounting points.
the rear deck speakers were MUCH easier then the front...just pop of the speaker grill on the deck and your set. 5 screws each side...thats it
the highs are much clearer and crisper and finally i have some great mid bass...every punch of the driver is crisp and clean...its a much different sound experience then HIFI system owner is used too...
.hope PnP amp comes out soon