I just realized that I never posted the pictures of my sub. I ended up facing it towards the backseat as there are rarely people in the back. I simply used two strips of Velcro to secure the box, so it doesn't fall over when I punch the gas. Also, note the positioning of the amp under the trunk floor.
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2019 M5 CP
formerly - 2018 M4
and before that - 2013 M3
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