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

This fuel rail plug kit from Mel's Manufacturing eliminates unwanted pressure relief of the Bosch diesel fuel rail

7 Powerstroke (2011-2014)

more responsive driving experience

ported anti surge racing cover and a upgraded billet compressor wheel with extended tips

comparable to that of the stock charger

6L 2500/3500 diesel truck

2017-2019 Duramax L5P Cab & Chassis 4" Downpipe Back Exhaust w/ Muffler (431024)

Performance dose is required when temperatures are below 0°F

you have the best cam combo on the market for the 1989-1998  dodge Cummins

Tighter Grain Structure: Our 178-208 steel cams are forged

if you need to re-torque or “hot-torque “the head

4L KC Fusion Compound Turbochargers