2011-2019 Powerstroke 6.7L 4" Downpipe Back Exhaust w/ Muffler (421012)2011 2019 Powerstroke 6. 7L 4" Downpipe Back Exhaust w Muffler (421012) 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!

Use with the AP0014 Valve Cover Gasket Kit

Comes complete with a safety wire provision and a copper washer for a tight seal

the oil will keep its viscosity which helps extend differential service life

2019-2024 Cummins 5" Flex Pipe Back Single w/ Muffler (511017 / 512014)

BD's design deflects the oil back onto the ring gear and into the pinion gear for cooler longer life

7L Dynomite Diesel Stock Reman Injector (DDP67-STK)

Upgrading EBPV Pedestal

Engineered for High Cylinder Pressures: Superior sealing under extreme conditions

with 6 acceleration levels & a security mode there is no need to program anything

6L Duramax L5P trucks

Extreme duty pushrods

and improved fuel economy