It's very possible you're getting bad data. Find a place near you for a couple of dyno runs with their wideband in the tailpipe. You'll know for sure.
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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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