Spool isn't necessary a function of rpm. It's a function of exhaust gas volume and velocity. Higher rpm would provide more exhaust gas, as does greater displacement.
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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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