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Depending on exactly where your going to mount them. I'd run them up towards the passenger side firewall, if your an A4 follow the tranny cooler lines, then go through the main firewal gromment, passenger side lower floor, under carpet, and through front side on console.
That would be my method. I'd use heavy insulation to cover the wires/protection. For instance on my alt power wire (2 gauge cable) i ran the cable through a 5/8" id high pressure hose for added security. that would be over kill, but safer than sorry. :cheers: