2003-2004.5 5.9 Cummins +100HP Injector Replacement Kit – OEM New



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Not available for sale in California.

Complete Kit $3,099.99

The kit includes:

5.9 2003-2004.5 Ram Pickup And Cab & Chassis (285 & 305 HP Engine)

These injectors are Brand New OEM injectors with upgraded nozzles. This injector set will give you approximately +100 horsepower at the wheels. If you are looking for a mild upgrade with the potential to make great power, look no further!  These are the most up to date version of the 5.9 injector. They are the highest quality, most reliable injectors available for the 5.9 L Cummins engine.



Please be advised that customized injectors with upgraded or substitute nozzles are modified from their original condition and are no longer “stock” injectors. To avoid any confusion, InjectorsDirect.com may remove any original part numbers from modified injectors prior to shipment. These parts are designed and modified for closed circuit competition use only and may not be legal for “On-Road,” “Off-Road,” or “Dual-Use.” Consult your owner’s manual, instructions for each product, and all applicable laws before undertaking these modifications. The vehicle owner and user are solely responsible for the legality and safety of the vehicle you modify using these parts. Compliance with state and federal emission standards is the customer’s responsibility. Use of these parts is at the customer’s own risk. Modified parts are subject to the InjectorsDirect.com policies in place at the time of purchase, including, but not limited to, InjectorsDirect.com’s limited warranty. They are not covered by any warranty from the original parts manufacturer. Do not purchase or install any part sold by InjectorsDirect.com if you do not agree with its policies or these terms and/or you do not feel competent in using them safely and correctly. Improper installation can lead to personal injury, death, and/or property damage. InjectorsDirect.com assumes no liability for the improper installation, improper product selection, or misapplication of the products. You are responsible for having your installer install the products correctly. All sales of modified injectors are final. No returns shall be accepted.

Replaces part numbers:

Bosch: 0 986 435 503,  0 445 120 018, 0 445 120 113, 0 445 120 210, 0 445 120 255

Mopar: R8004082AA, R8004082AB, R8004082AC, R5086894AA, R8310748AA

Cummins: 3949619, 4940589, 5254686, 5263318, 3949913

They carry a three-year warranty. Information about warranty policies can be found HERE.

Each injector includes all hardware necessary for installation (O-rings, copper crush washers).


Brand new OEM connector tube with o-ring. With a larger orifice, these are an upgrade for 5.9 owners & allow more fuel to be supplied to the injector.  We recommend these be changed when replacing your injectors. Re-using old tubes can lead to leaks, contamination, and premature injector failure.

Replaces part numbers:

Mopar Part # 5086874AB, 5175565AA

Cummins: 3979419

Bosch Part # F 00R J01 572


Brand new set of high pressure fuel lines. Replacing the fuel lines helps prevent premature injector failure. To prevent line failures, injection lines for cylinders 2 – 6 incorporate the updated isolators. An isolator is not used on the first cylinder.

Replaces Mopar Part #s

5086871AA, 5086872AB, 5086873AB, 5086874AB, 5086875AB, 5086876AD

Replaces Cummins Part #s

3957081, 4988810, 4988809, 5289447, 4988807, 4988806


Kit includes gasket, six retaining screw o-rings, and oil filter cap seal o-ring. We recommend these be replaced when installing new injectors to avoid leaks.

Replaces Mopar Part # 5086954AA