2020-2023 Duramax L5P 4" Downpipe Back Exhaust No Muffler (431028) 2.8L

2020-2023 Duramax L5P 4" Downpipe Back Exhaust No Muffler (431028) 2.8L2020 2023 Duramax L5P 4" Downpipe Back Exhaust No Muffler (431028) 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

and improved air-flow with this system

Get the most fuel flow possible from your stock CP3 pump by eliminating possible cavitation damage to the CP3 pump from excessive suction required by high-pressure CP3’s fuel injection pump with this “high flow” PPE CP3 Pump Inlet Fitting

For extreme builds

2001-2016 Duramax PPE Up Pipe Bolt Set (116121500)

Using head studs instead of standard head bolts provides your engine with the clamping force required to keep your cylinder heads from lifting and blowing a head gasket due to higher combustion pressures

Gasket Specifications

transmission temperatures also dropped much quicker than they did with the factory-installed stamped steel pan

A radiused cutter is strongly recommended for all groove work

Stock springs rated at just 80 lbs 0f seat pressure (at 1

SynShield® Durability Advantage 15W-40 Engine Oil is a premium advanced performance

and billet wheel

Brand new injector set flowing at 15 percent over