2017-2019 Duramax L5P 4" Downpipe Back Exhaust w/ Muffler (431021)2017 2019 Duramax L5P 4" Downpipe Back Exhaust w Muffler (431021) 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! IMPORTANT NOTE: These kits will

For further protection

and putting Powerstrokes in their place

Gator Fastener's Black Oxide exhaust manifold studs are 12

critical issues when boost and RPM levels rise

Stock injectors: GRAPH 1

This injector set comes with SAC style nozzles flowing at 100 percent over and the injectors have had internal calibration upgrades for added fuel delivery

Part Type: Main Bearing Sets

which can promote carbon and gunk buildup in your intake manifold

0L 4" Turbo Back Exhaust 3

Universal Ford switches are orange and white and come with two positap connectors for installation

45 degree 1

drivability