There's going to be a slight variation in fueling between the banks. Uprev only allows you to adjust fueling globally, so you just have to tune for the leanest side. It's not such a difference that you'll ever notice. One of the things Ecutek "has" is the ability to tune fueling per bank, so if you're on the fence about software that might be a concern.
I would assume datalogging the OEM O2 sensors will show you which side runs a little leaner and you could put your wideband in that test pipe.
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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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