The MAP sensor on most FI builds gets turned off by the tuner, since it doesn't know what to do with positive pressure and throws a code. Most tuners disable the code. Might want to mention that to him.
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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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