I thought the hiss was a characteristic of the motor, not the cat. In cars without cats, the hiss is much worse. How can yours avoid making that noise?
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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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