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Not really a how to, more info really.
Fitted this sub last year, box is sold on ebay as an e93 box but fits just great in the coupe. Its not clear in the picture but it is angled slightly on the face.
I have it stuck down with 2 strips of velcro and hasn't budged in a year but would be possible to add a couple of brackets to secure it.

What amp are you using and how did you wire it in?
I want to put in an Edge active sub in my Coupe, but cannot figure out how?
Cheers