2019-2024 Cummins 6.7L 5" Flex Pipe Back Single w/ Muffler (511017 / 512014)2019 2024 Cummins 5" Flex Pipe Back Single w Muffler (511017 512014) Constructed out of 16 gauge aluminized steel or T409 Stainless, this exhaust system is designed to simplify installation with included clamps, preweld contour bends and improved flanges. Enjoy a noticeable boost in performance, lowered EGTs and amplified air flow with this Mel's system. For powerhouse performance, Mel's delivers horsepower you can hear!

Both of these scenarios cause their own list of run-ability issues

2020-2022 Duramax L5P 4" Downpipe Back Exhaust w/ Muffler (431027)

Warranty Considerations: We only warranty our cams if you run Hamilton springs and tappets—protect your investment from avoidable wear and damage

has thicker blades

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The kit is complete with everything needed for a seamless installation

Gen 3 Hemi’s and Sport Compact engines

45″ tappet face

Available: STD

The oil filter is your engine’s first line of defense against contaminants that degrade oil performance and reduce oil lifespan

Nozzles flow at 100 percent over with mild injector body modifications for added fuel delivery

You receive every part you need to complete your gasket repair in one package (unless otherwise stated)