Do you mean all of the supporting mods, or just tuning and monitoring? Gauges will come down to personal preference as far as type as long as you don't get some Prosport garbage. As far as which gauges, boost and AFR are the bare minimum. As far as where you hook them up, boost will take a reference off a pressurized part of the intake tract like the manifold. AFR will either use your OEM O2 sensors or an additional one.
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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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