The cat back is going to determine 95% of your sound. You'll get the most power from test pipes, but they won't make it dramatically louder on the stock cat back.
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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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