I have an idea - the shop that installed your EBC is incompetent. This isn't the first (or even second) time they've caused you boost related issues. Take it to a different shop or be prepared to learn a very expensive lesson.
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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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