There's no " best" anything when it comes to NA mods. Once you do all the usual bolt ons and tune, you'll be around 320-330 whp after a tune no matter what brand you buy.
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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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