Are you on OEM plugs? The GTR plugs are 1 step colder, and a lot cheaper than the HKS plugs GTM recommends. That's about it. They're not really going to add any power. If you're still on the stock plugs, go ahead and switch them out.
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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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