Keep in mind that the base tune from GTM will be sufficient to drive pretty much anywhere for the tune. Just don't go nuts. GTM's base maps leave a lot to be desired, but they're usually pretty safe.
Other items to ask about:
Fan duty cycle
Throttle re-mapping (Take the most current map from the big thread here)
Speed limiter removal
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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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