Stillen headers are garbage. Either LTHs or Z1 headers are the only options that add power, both of which will not allow VQ37 HFCs.
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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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