Covers installation of BMW X5 Subwoofer system for X5 00-06 (E53). Part 1 shows removal of original subwoofer (if present). Part 2 shows accessing the OEM amplifier and battery. Part 3 and 4 show amplifier connections. Part 5 shows amplifier power and ground for the subwoofer system. Part 6 shows fuse install, first amp sound test and amp mounting. Part 7, the final part, shows rear hatch assembly and final amplifier tuning.