You'll need to find a place upstream of the cat to weld in a new bung for the aftermarket O2 sensor. The car needs the O2s that are in there now, so you would need an additional sensor for an aftermarket gauge.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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