Wow this thread has really taken off. I was debating whether to go with JL Stealthbox or BSW subwoofer and now I see this. I am very interested in how this sounds to the other members that have installed it.

I am now seriously considering this option. Since I have never done this before I think I should try doing it with cardboard first.

Please post pictures!!!!

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[Sold] 2004 X5 4.4i - Sterling Gray - Truffle Brown, Sport, Preminum, Rear Climate, DSP, Sirius, PDC, 132's (19 inch wheel), Comfort Seats
Dynavin, JL Audio Stealthbox, Alpine PDX-5 Amp