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We have 2 4" speakers in front doors, 2 4" in rear parcel and 6.5" subbies under front seats in a standard system E90 sedan. CRAP CRAP CRAP I say!! I want to upgrade mine...but Ive been advised that the depth of the door speakers are slimmer than normal and have to make sure aftermarket ones arent too deep where you cant get the speaker coveres back on!!!
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