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      06-23-2017, 09:34 PM   #7
Billfitz
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Drives: '15 328iX GT
Join Date: Jan 2015
Location: New Hampshire

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They're totally different. HID work best with a separate power relay that connects to the fuse box. The only thing the original wiring does is to energize the relay, with the power to the lamps coming from the relay. That means lots of wiring changes, as each lamp requires its own relay. HID also tends to be less friendly with reflector housings. Those are the reasons I didn't use them.
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