I'm not saying there's no power increase from the axle back portion, just that it's the last part I'd change if I were looking at power. Go buy a used full exhaust off the classifieds here. See if that's enough. If not, add in HFCs or test pipes later. You won't have leaks if you install them right. The hiss isn't really that bad. Certainly not anything to make your mod plans around.
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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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