It depends on the 91 tune. If it's super aggressive, no. If it's a fairly conservative tune, he might be better with that than the stock map. That's why he should look at some data logs and see how it looks.
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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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