I'm still a little confused. If you are unwilling to get a tune, what's the AFR gauge going to show you that you can't find out with a few dyno pulls?
And FYI the oil cooler will have no effect on warranty. You need to find a new dealer.
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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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