The box has some spaces around it at the botton which I filled with sound deading materials to isolate the wood from the metal. I did not allow any touch between the wood and the metal car body as this will cause rattles in bass sound.

As for the video, do you think it will bring the real sound? I will try anyway.

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BMW 1M 2012 - Current
Jeep Grand Cherokee Limited 2011 - Current
BMW E93 330i Convertible 2009 - Sold
BMW E46 320i 2004 - Sold
BMW X5 4.4i 2002 - Sold
VW Golf GTI 2000 - Sold
BMW 740i 1996 - Sold