4" Cat Back Duals | 2001-2005 GM 2500/3500 6.6L DURAMAX w/ OEM 4 Bolt Flange

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  • Regular price $525.00
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This FLO~PRO 4" cat back duals is for the 2001-2005 GM 2500/3500 6.6L DURAMAX LB7-LLY. It replaces your restrictive OE System with an improved 4" mandrel-bent exhaust. This kit not only sounds great but will improve the torque, mileage, and throttle response on your 6.6L! With this system, you can expect great sound and superior performance coming from stock.



  • Ease of installation
  • Contour Bent Hangers
  • TorcTite® Clamps
  • Retains for Cat for Emissions
  • OEM Style 4 Bolt Flange
  • No Bungs
  • Fits Cab/Box Configurations: EC-CC/SB-LB-Dually



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