You don't necessarily ever have to get tuned at all if the catback is your only mod. There's a long thread discussing this. You'll be fine.
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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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