Fleece Performance Duramax & Cummins Diesel Parts

What This Collection Covers

Fleece Performance Engineering builds its catalog around the Duramax and Cummins common rail diesel platforms that dominate the high horsepower diesel truck community. Founded by brothers Brayden and Chase Fleece in a rural Indiana pole barn, the company grew into a technology leader in common rail injection systems, developing the Cheetah turbocharger line and the TurboBrake electronic exhaust brake that have become reference points for diesel performance engineering.

Cheetah Turbocharger Upgrades

Cheetah billet turbocharger upgrades for the LLY, LBZ, LMM, LML, and L5P Duramax and 6.0L Power Stroke engines improve compressor wheel and turbine efficiency over the factory Garrett turbocharger while retaining the factory mounting location and piping for a clean install.

Fuel System Components

Fleece fuel system products including high flow lift pump kits, CP3 pump upgrades, and dual CP3 conversion kits address the fuel delivery limits that keep injector command volumes from being met at high power output. Under bed and engine mounted fuel filter assemblies for Ram Cummins and Ford Power Stroke round out the fuel delivery lineup.

TurboBrake Exhaust Brake

The TurboBrake electronic exhaust brake for Duramax applications creates variable exhaust backpressure for engine braking without the heat and brake wear that comes from relying solely on foundation brakes when descending grades with heavy trailer loads.

Cooling System Parts

Aluminum replacement coolant tanks, cooling fan pigtails, and coolant return plugs keep Cummins and Power Stroke cooling systems running reliably under the added thermal load of tuned and turbo upgraded builds.

Gaskets and Hardware

Upper gasket sets with and without head gaskets for the 6.7L Cummins, along with dual pump hardware kits and exhaust back pressure relocation kits, support engine and fuel system service work on Ram Cummins trucks.

Duramax Engine Generation Coverage

Fleece Performance covers every Duramax generation including the LB7 from 2001 to 2004, LLY from 2004 to 2005, LBZ from 2006 to 2007, LMM from 2007 to 2010, LML from 2011 to 2016, and the L5P from 2017 onward, with turbocharger, fuel system, and sensor products specific to each generation's injection architecture.

Cummins Engine Generation Coverage

Cummins 5.9L and 6.7L ISB engine coverage includes turbocharger upgrades, fuel system improvements, and coolant and gasket components for both 12 valve mechanical and 24 valve common rail variants used in Ram 2500 and 3500 trucks.

Top Fleece Performance Product Lines

• Cheetah Turbochargers. Billet compressor wheel upgrades for Duramax and Power Stroke platforms
• TurboBrake. Electronic exhaust brake for towing and grade descent control
• CP3 and CP4 Pump Kits. High pressure fuel pump upgrades for Duramax and Cummins
• Fuel Filter Assemblies. Under bed and engine mounted filtration for Cummins and Power Stroke
• Coolant Tanks. Aluminum replacement tanks for Ram Cummins applications
• Gasket Sets. Upper engine gasket kits for 6.7L Cummins rebuilds
• Sensor Pigtails. Universal and vehicle specific wiring pigtails for common diesel sensors

How to Choose the Correct Fleece Performance Part

• Confirm your exact engine generation, LB7 through L5P for Duramax or 12 valve versus 24 valve for Cummins
• Check the exact model year range since Fleece parts are cataloged by generation and VIN range
• Verify whether your truck retains factory emissions hardware if selecting fuel or turbo upgrades
• Confirm turbocharger kits match your factory mounting location and piping configuration
• Check fuel filter assembly location, under bed versus engine mounted, against your truck's configuration
• Confirm gasket sets match whether you need the head gasket included or a gasket set only
• Review sensor pigtail pin count and connector style against your factory harness
• Confirm coolant tank fitment against your exact cab and bed configuration

Common Questions

What trucks does Fleece Performance support?

Fleece Performance builds parts specifically for Chevrolet and GMC Duramax diesel trucks and Ram Cummins diesel trucks, along with some coverage for Ford Power Stroke applications.

What is the Fleece Cheetah turbocharger?

The Cheetah uses a billet aluminum compressor wheel machined to tighter clearances than the factory cast wheel, improving airflow efficiency and spool response while retaining the factory turbine housing dimensions for a direct replacement install.

What does the TurboBrake do?

The TurboBrake creates variable exhaust backpressure electronically to provide engine braking, reducing wear on the truck's foundation brakes during long downhill grades with a loaded trailer.

Do I need a CP3 upgrade for my build?

A CP3 or CP4 pump upgrade becomes necessary when injector fueling demands exceed what the factory pump and lift pump can supply, which typically happens once tuning and injector upgrades push horsepower well above stock levels.

Will Fleece parts work with factory emissions equipment?

Many Fleece products are designed to integrate with or work alongside factory aftertreatment systems including SCR and DEF injection, but confirm the specific part's compatibility if maintaining street legal emissions equipment is required.

What Duramax generations are covered?

Fleece Performance covers LB7, LLY, LBZ, LMM, LML, and L5P Duramax generations, each with turbocharger, fuel system, and sensor products specific to that engine's architecture.

Are Fleece gasket sets available with or without head gaskets?

Yes, Fleece offers upper gasket sets for the 6.7L Cummins both with and without the head gasket included, depending on the scope of the rebuild.

What is a dual CP3 conversion kit used for?

A dual CP3 conversion kit adds a second high pressure fuel pump for extreme horsepower Duramax builds that exceed what a single CP3 pump can supply.

Do sensor pigtails require cutting into factory wiring?

Fleece universal sensor pigtails are designed to splice into existing sensor circuits, so some wiring work is typically required during installation.

Is Fleece Performance a good fit for towing focused builds?

Yes, the TurboBrake and cooling system upgrades are especially popular with owners who tow heavy trailers regularly and want reduced brake wear and better thermal management.

Why Buy Fleece Performance Parts from Black Ops Auto Works

Black Ops Auto Works stocks 333 Fleece Performance SKUs across turbochargers, fuel systems, cooling, and gaskets with real fitment data, competitive pricing, and support from staff who build these trucks themselves. Products are filterable by year, make, model, and engine generation to confirm the correct application before ordering.

For focused shopping, browse our Fuel Delivery, Fuel Injectors, Turbochargers & Components, Programmers & Chips, and BD Diesel.