E60 / E61 (2004 - 2010)
QUESTION #1 - I have a 2004 BMW 525i, and I love it, but the stereo sucked to be honest. So I decided to get 2, 12" kicker COMP r Sub-woofers. They really do pack the punch, but I read all across the internet to find a way to port the air into the cabin of the car from the trunk.
Are there any...