1st Gen. 1 Series (2004-2013 | E81, E82, E87, E88)
Hi guys, this is my first post here so apologise if anything isn’t quite spot on!
(professional HU, not 100% sure what HIFI I have from factory, tweeters in pillars, 1/ front door and 2 by the boot and 1 sub under passengers side (not sure about amp))
I bought a pair of Focal ISUB 4’s and upon...