You very well may get a CEL. Either try the spark plug anti foulers in the bung, or get a tune. The HFCs shouldn't effect the MPG other than you flooring it more often to enjoy the new power. For responsiveness, get a tune and have them tweak the throttle tables.
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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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