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2011-2015 Duramax Flo Pro 5" Downpipe back Exhaust With Muffler


2011-2015 Duramax 5" Downpipe Back Exhaust (FLO 664)

Fits: 2011-2015 GM LML w/ 6.6L Duramax & V-band flange at Downpipe

The FLO-664 by FLO-PRO is a 5" Downpipe Back Exhaust for the 2011-2015 LML. This kit allows you to drop out your restrictive OE exhaust system and replace it with a high-flow system that includes a performance muffler. This exhaust system not only looks and sounds great, but will improve your mileage, throttle response, and torque in your LML.

Note: This kit will only fit an LML with the V-Band flange of the downpipe. If your LML has the 3-bolt connection at the downpipe you want to use the 2015.5-2016 Duramax Kits!


  • 5" Downpipe Back Race Exhaust
  • Includes High Flow Muffler¬†
  • Increased Torque & Fuel Mileage
  • Aluminized Steel & Stainless Steel Options
  • Single Side Exit
  • Easy Install - Mounts to OE Hangers

Part Number: FLO 664