I ran mine down under the console. Unbolted the back, IIRC, and ran it under the carpet to the rear hatch area.







You could also try to run it down the side but my rationale at the time was that there were fewer things to disassemble going under the console

Mike

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Mike
Dallas, TX & Appleton, WI
2003 E53 4.4i Pearl Beige
2003 E46 330Xi Monaco Blue
2007 E90 335Xi Black Sapphire Metallic
2011 F25 X3 28i Black Sapphire Metallic