The hiss comes from the motor itself, so you're just going to have to deal with it if you run test pipes. Even HFCs wont eliminate it completely. And the washer mod is just creating an exhaust leak under your car. Some people like it. Many do not. I'm not sparking that debate again.
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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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