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The V3 kit doesn't need a ground. The V2 kit attaches to a negative terminal which in the N54 is underneath there the tube for the windshield washer fluid is.. But I don't know if that's also there on the N55. It should also work if you just attach it to any screw in the engine bay that's connected to the metal body of the car (unpainted metal).
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2022 X4 M40i - 2008 135i - 2015 F700GS
On Order - 2024 i4 M50
Scruffy's gonna die the way he lived... Mmhm.
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