Neither of those are necessary around the 500whp level. Going more than that will take e85 or a built motor. Lower compression pistons are better than a thicker head gasket.
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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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