JL audio 13w7 sub woofer. JL audio slash amplifiers Custom fiberglass trunk setup. Vented enclosure for maximum SPL. Airbrushed to perfection!Custom 1 piece fiberglass trim panel. 1mm bigger and it will not fit.Painted Jet Black to match the exterior of the vehicle. The port for the sub woofer comes in front of the driver.....push double the amount of air. Very clean but complex enclosure. The nicest w7 install in a BMW.
