If you've already got Ecutek, why not just have your tuner spend a little more time fine tuning the throttle response? An hour or two of a tuner's time is usually cheaper than the cost of the sprint booster.
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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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