For reliability, go get a custom tune and explain your concerns to the tuner. Leave it a little richer and don't add so much timing. You can still get plenty of power. The Garrett setup can make far more power than the stock block can handle without meth.
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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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