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1) dont need a harness
2) dont need to remove headlight. for xenon cars there's a flap inside the wheel well to access the bulbs and change them. it should be the same for halogens im guessing
4) 35w or 55w is fine. 55w is brighter but produces more heat. may cause yellowing of the housing from the inside though (this usually happens on cheaper cars...bmw SHOULD be fine..key word SHOULD
5) You have to get a kit with CANBUS (error canceller/capacitor w.e you want to call it).
Ideally get one that has it built into the ballast cause sometimes the voltages of the add on ones comes out different than each other so one side will be brighter than the other of slightly off color.
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