A friend of mine has a pair of L7 15"s in a dual chambered ported box in the back of an extended cab f-150.. OMFG. Like at least 10dB louder then my HC, but then again my HC was seeing 800 watts, and his L7's were seeing 1300w per sub. it literally hurts to sit in it, i would love to get it metered, but he needs a new alt and a pair of yellow tops to be sucessful in the lanes.