As I need to run the O2 wire from the motor to the gauge for my PSB-1 I looked for a passthrough, finding nothing, I searched for 20+ minutes, closest I came was a thread on Bimmerforums with derision over asking where the firewall was.
I am pretty sure had my interior not been gutted I would not have found this, passenger (right) side (US car) it exits behind the aux air pump.
I also need to run 2 wires to get the oil & water temp data to the gauges.



















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