Here's my e-mail exchange with HIPRO POWER. I don't think I'm going to use their bulbs afterall.
Thanks for your message. Normally it will not burn your stock housing.
However we do suggest you purchase wire harness to be 100% protect your stock housing form burning because even your stock bulb still has chance to burn your housing too. Thanks.
> I'm interested in your H7 5900K 100W HID bulbs. My BMW uses 55W bulbs
> and I'm afraid the 100W bulbs will draw too much power and potentially
> damage the wiring harness and/or overheat the plastic lens assembly.