Down pipes and test pipes are the same thing. All I was recommending was to keep the diameter consistent between the down pipes and car back. If you go with 3" down pipes and a 2.5" catback expect to have to take it somewhere to get the two to mate up.
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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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