Went to an exhaust shop and they all want $100 to weld the bung so looking at simply replacing my OE sensor...
I'm reading the manual and it says that I should be able to use the WB sensor instead of the OE sensor. It must be used in the right format for the ECU....but this is what I am reading:

Connect ECU to following MTX-L wiring:

Analog Wire 1 (yellow) -- 0v = 7.35 AFR 5v= 22.39 AFR
Analog Wire 2 (brown) -- 1.1v = 14 AFR 0.1v = 15AFR

In the Narrowband section it mentions using Wire 1(yellow), but should I ACTUALLY use Wire 2(brown) since MB uses 0-1v? Any ideas?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k