This M3 needed a substantial, but stealthy audio upgrade. Paul hid a TMA amplifier under the carpet in the trunk which powers a JL Audio 12W6v2 subwoofer.
A fiberglass mold of the rear quarter panel was cast as the foundation for a subwoofer enclosure that matches the shape, color and texture of the other factory panels.
Technician:Paul F.
Salesman:Shawn K.
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