2003-2004 Ram 2500/3500 5.9L Cummins Engine & Performance

2003-2004 Ram 2500/3500 5.9L Cummins Crate Engines

Crate Engines

2003-2004 Ram 2500/3500 5.9L Cummins Gaskets, Gasket Kits & Bearings

Gaskets, Gasket Kits & Bearings

2003-2004 Ram 2500/3500 5.9L Cummins Head Studs & Main Studs

Head Studs & Main Studs

2003-2004 Ram 2500/3500 5.9L Cummins Heads & Valve Train

Heads & Valve Train

2003-2004 Ram 2500/3500 5.9L Cummins Oil Pans

Oil Pans

2003-2004 Ram 2500/3500 5.9L Cummins Radiators & Cooling Upgrades

Radiators & Cooling Upgrades

2003-2004 Ram 2500/3500 5.9L Cummins Rebuild Kits & Internal Parts

Rebuild Kits & Internal Parts

2003-2004 Ram 2500/3500 5.9L Cummins Rods, Pistons, Cams & More

Rods/Pistons/Cams & More

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Industrial PDM-59RBB Race Performance Builder Box | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
Industrial PDM-59RBB Race Performance Builder Box | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

Industrial Injection

Industrial PDM-59RBB Race Performance Builder Box | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

SKU: IISPDM-59RBB
$15,034.95
Industrial PDM-59CRRH Stage 1 Race Performance Head | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
Industrial PDM-59CRRH Stage 1 Race Performance Head | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
Industrial PDM-59CRRH Stage 1 Race Performance Head | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

Industrial Injection

Industrial PDM-59CRRH Stage 1 Race Performance Head | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

SKU: IISPDM-59CRRH
$6,370.91
Industrial PDM-59CRSTH Street Performance Head | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
Industrial PDM-59CRSTH Street Performance Head | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

Industrial Injection

Industrial PDM-59CRSTH Street Performance Head | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

SKU: IISPDM-59CRSTH
$4,603.57
Industrial PDM-06020 12mm Gorilla Girdle with ARP Main Studs | 2003-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
IN STOCK
Industrial PDM-06020 12mm Gorilla Girdle with ARP Main Studs | 2003-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Industrial PDM-06020 12mm Gorilla Girdle with ARP Main Studs | 2003-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins

Industrial Injection

Industrial PDM-06020 12mm Gorilla Girdle with ARP Main Studs | 2003-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins

SKU: IISPDM-06020
$1,321.09
Fleece FPE-OC-CR-F-BLU Billet Oil Cap Cover - Blue | 2003-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
IN STOCK
Fleece FPE-OC-CR-F-BLU Billet Oil Cap Cover - Blue | 2003-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins
Fleece FPE-OC-CR-F-BLU Billet Oil Cap Cover - Blue | 2003-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins

Fleece Performance Products

Fleece FPE-OC-CR-F-BLU Billet Oil Cap Cover - Blue | 2003-2018 Dodge RAM 2500/3500 5.9L/6.7L Cummins

SKU: FLCFPE-OC-CR-F-BLU
$34.99
DiabloSport 7303 Predator 2 Tuner | 2004-2012 Dodge RAM 5.9L/6.7L 2500/3500 Cummins
DiabloSport 7303 Predator 2 Tuner | 2004-2012 Dodge RAM 5.9L/6.7L 2500/3500 Cummins

DiabloSport

DiabloSport 7303 Predator 2 Tuner | 2004-2012 Dodge RAM 5.9L/6.7L 2500/3500 Cummins

SKU: DSP7303
$532.95
BD Diesel 1040023 Killer Frost Plug Plate | 2003-2018 Dodge RAM 5.9L/6.7L 2500/3500 Cummins
IN STOCK
BD Diesel 1040023 Killer Frost Plug Plate | 2003-2018 Dodge RAM 5.9L/6.7L 2500/3500 Cummins
BD Diesel 1040023 Killer Frost Plug Plate | 2003-2018 Dodge RAM 5.9L/6.7L 2500/3500 Cummins

BD Diesel

BD Diesel 1040023 Killer Frost Plug Plate | 2003-2018 Dodge RAM 5.9L/6.7L 2500/3500 Cummins

SKU: BDD1040023
$70.95
$75
SAVE $4.05
Edge 31402 Juice w/Attitude CS2 | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins
Edge 31402 Juice w/Attitude CS2 | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins

Edge Products

Edge 31402 Juice w/Attitude CS2 | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins

SKU: EDG31402
$979.95
$1,210.95
SAVE $231
Edge 30203 EZ Module | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins
IN STOCK
Edge 30203 EZ Module | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins

Edge Products

Edge 30203 EZ Module | 2003-2004 Dodge RAM 2500/3500 5.9L Cummins

SKU: EDG30203
$584.95
$658.95
SAVE $74
Mahle 54556 Victor Reinz 1.10mm Thick Head Gasket | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins
Mahle 54556 Victor Reinz 1.10mm Thick Head Gasket | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

Victor Reinz

Mahle 54556 Victor Reinz 1.10mm Thick Head Gasket | 2003-2007 Dodge RAM 2500/3500 5.9L Cummins

SKU: MCI54556
$448.50

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If you're looking to turn your 5.9L Cummins into a beast that can handle anything thrown its way, check out our Engine & Performance upgrades!  When it comes to every aspect of performance, from cooling upgrades to free flow pipes and intakes, we've got your truck covered. From tuners & modules, oil pans, valve covers, and even high-performance crate engines, Alligator Performance is sure to have what you need in order to upgrade your Ram 5.9L Cummins. Whether you're looking to add more power, reliability or durability, we have you covered at Alligator Performance. Pair your new engine upgrades with our selection of top tier Turbo Upgrades! Ram Cummins Fitments: 2003, 2004 Ram 5.9L Cummins. Submodel Fitments: Tradesman, Laramie, Laramie Longhorn, Big Horn, Limited, Lone Star, Power Wagon. Some exceptions apply, please see individual product pages for specific fitments.

Tuners & Modules
Cooling Upgrades
Head Studs & Main Studs
Oil Pans, Valve Covers & Accessories
Crate Engines & Engine Rebuild Kits

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