The vacuum operated ones kinda work like an internal wastegate on a turbo. It's sprung open and the vacuum sucks it shut. The electric ones are just motorized butterflies.
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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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