Are you sure it's not the throttle body noise? They whine after shutdown, and then you hear a click.
RT Tuning is good. They'll solve your problems. $100/hr is pretty standard for shops. Boosting a car that came from the factory NA costs more than you initially budget. If you can't afford to have a good shop look the car over and tune it, you sure as hell can't afford not to. A replacement shortblock is LOTS more money than a few hours of diagnosis and a good tune.
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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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