GTM's sc kit makes a ton more power. It's a better engineered kit. Stillen uses a good blower, but skimps on everything else like fuel, intercooling, etc. We have never seen a Stillen kit make 500 whp. It's common for GTM SC kits to make 500 whp. My advice would be to sell the Stillen kit and buy the GTM, unless you're the kind of guy who wants to be the first to do something.
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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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