They usually tap the blank area where there would usually be another temp sensor on the head like older m50/s50 heads. But you could tap the coolant feed hole if you're not using it. To clean it out just flush the system (easier since you have the motor out) using a hose. About the wiring diagram, I have to pull it up as I have to find it and make it reasonably easy to read.
Anyways, picked up a 98 m3 stock muffler in mint condition for 25 bucks.
Just need obd2 midpipes to complete the set.


Anyways, picked up a 98 m3 stock muffler in mint condition for 25 bucks.
Just need obd2 midpipes to complete the set.



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