I used the ctek 4.3 mus on winter mode . I also used the alligator clips to charge. I will however install the hard line connections to my 335i first and then to the X3. It's probably a fairly similar install location.
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GTX3076R , ADV, JB4, FMIC, BOV, 17"APEX, 255/40/17 SQ, 6-SPD Manual
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