u have stock headunit or iDrive ?
hifi ? what amp are they going to use for your sub?
I have a mono amp and kicker 12" L7 going to install soon had in my previous car, but trying to sell the 12 and get a 10" better (for trunk *******. my cousin has 2 x 12 rockford and i must im impressed it sounds so clear
Current 16' X4 M40i LBB @Frikiton
Past: 14' X3 xDr28i M-Sport DHP EnzoTuned 300R+
MY16' X4 M40i Videos