2003 BMW X5 4.6L The factory offers dual 6" ported subs in this right rear quarter, with very poor performance. We constructed an intricate subwoofer enclosure to fit in the original location. The solid plastic cover was also perforated for better performance.

2003 BMW X5 4.6L The new .6 cu ft sealed enclosure houses a JL Audio 10W3V2 subwoofer mated to a Zapco amplifier. The performance was a huge improvement.