Yes, you need to re-tune to account for the larger injectors and E85. You could just change the injector scaling to limp it to the tuner, but before you put your foot in it re-tune the car.
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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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