2001-2004.5 Duramax 5" Downpipe Back Exhaust w / Muffler (531100 / 532100)

Flo-Pro Exhausts are designed to fit all wheelbase & cab configurations unless otherwise specified.

The 531100 & 532114 is a 5" Downpipe Back exhaust for the 2001-2007 Duramax Trucks. This will replace the restrictive exhaust system with a 5" high-flow system with a high-flow muffler for street applications. Just like all of Flo-Pro exhaust kits, it will come with all the required clamps, pre-weld contour bent hangers, and stronger flanges to help you sail through the installation process. This exhaust not only sounds great but will help improve your mileage, torque, and throttle response in your Duramax!

Part Number: 531100 & 532100

• 5" Downpipe Back Single Exhaust system.
• Includes Muffler
• Aluminized Steel & Stainless Steel Options
• Single Side Exit
• Easy Install - Mounts to OE Hangers

Aluminized steel is the budget-friendly choice. It has a protective coating that holds up well, but once that coating wears it will eventually rust through, especially in salted winter climates. The stainless option is T409 stainless, an automotive-grade steel built to resist rot, and it will typically outlast the truck. T409 is not polished show-grade stainless, so light surface rust or discoloration can still show up over time. That is cosmetic only and won't affect performance or service life.

• The box this product comes in may be labeled as 01-04.5, and the instructions may be listed as 01-04.5. However, this System will fit all the way from 2001-2007 models.

Don't see your question? Ask us anything about this product.

• ?

  Why will this not fit an LBZ? Description says 01-04.5

  This will fit with your LBZ!

• ?

  Will this fit my 03 extended cab dually?

  Yes!