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I own a 1994 BMW 540i and planning to install a subwoofer box in my trunk. I was wondering if there was a firewall in between the trunk and the cabin.

This will help me out tremendously..

Thanks
 

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Yup, but since its a German car, it has a handy little area behind the rear fold-down armrest. It is a ski port. Just knock out the piece of metal there (its perforated). I built a 5th order bandpass box with the port firing right through that opening. Keeps the trunk from rattling, and as much bass as I'll ever need. Hope that helps...
 
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