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I’ve purchased a wiring harness for a 2017 340i (they have 2 valves on the stock exhaust vs one on the M2), from what I can see it is a Y cable and should fit with the valves (one from Remus and one stock that gets transferred over to the new exhaust.
Part number is 18-30-2-414-899, I’ll report back if it works so that anyone in the same spot has a fix.
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