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2011-2015 Duramax Flo Pro 5" Downpipe back Exhaust-No Muffler


2011-2015 Duramax 5" Downpipe Back Exhaust - No Muffler (FLO 664NM)

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

The FLO-664NM is a 5" Downpipe-Back Exhaust System by FLO-PRO for the 2015.5-2016 6.6L Duramax. It's the perfect kit if you're looking to remove your stock components and replace it with high-performance & high-flow 5" piping from the Downpipe back! You'll notice fuel mileage improvement, increased torque, and you'll have a much better sounding 6.6L!


  • 5" Downpipe Back Race Exhaust
  • No Muffler Included - Straight Pipe
  • Increased Torque & Fuel Mileage
  • Aluminized Steel & Stainless Steel Options
  • Single Side Exit

Part Number: FLO 664NM