It's not necessarily a must if you're ok with running a set amount over wastegate pressure. HKS makes a great unit, but AEM and Turbosmart make good stuff too.
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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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