BMW, being a dynamic auto maker, offers many factory retro-fit kits from everything from an I-pod interface on a 3-series to a tow hitch on a BMW X5. These kits are factory tested and approved for the correct wiring, power requirements, and vehicle software updates. Being directly from BMW, you can trust that these systems are both tested and reliable and will only improve the ultimate driving machine and not cause new issues like many of the aftermarket equivalents. Boston Motor Werks supports and encourages use of these kits and can install any of them at our facility.