Product Description
Take your early common-rail 5.9L to the next level. The INDUSTRIAL INJECTION 0986435503SE-R2 is a remanufactured R2 (Race 2) injector calibrated ~46% over stock for about a 125 HP gain on the right setup. Built in a Bosch-authorized facility and flow-balanced for consistency, it’s a direct-fit upgrade for 2003–2004 Dodge Ram 2500/3500 5.9L Cummins (305 HP trucks).
- ~46% over fuel flow (R2) with ~125 HP potential when properly supported.
- Remanufactured, tested, and balanced; includes new sealing washers and O-rings.
- Direct replacement for 2003–2004 5.9L Cummins common-rail applications.
Fitment
2003–2004 Dodge Ram 2500/3500 5.9L Cummins (early common rail, Bosch base p/n 0986435503).
Recommended Supporting Parts
- CP3 Injection Pumps (03–07 5.9L) — stock & performance options to keep up with added fuel.
- Injector Install Kit (03–05) — new high-pressure lines, six connecting tubes, valve cover gasket, and heater gaskets.
- 5.9L CR Injectors & Accessories — shop related components and packs.
- Connecting/Feed Tubes — replace to avoid contamination and sealing issues.
- Valve Cover Gasket (03–05) — OE seal when servicing injectors.
- 03–07 Fuel System Components — rails/sensors, filtration, big-line kits, lift pumps & more.
Specifications
| Manufacturer | Industrial Injection |
|---|---|
| Part Number | 0986435503SE-R2 |
| Flow Increase | ~46% over stock (R2) |
| Estimated Gain | ~125 HP with proper supporting mods |
| Configuration | Single common-rail injector |
| Fuel System | Bosch Common Rail (CR) |
| Vehicle Fitment | 2003–2004 Ram 2500/3500 5.9L Cummins |
| Warranty | 1-Year (per manufacturer) |
| Core Charge | May apply (see cart) |
| UPC | 840256901863 |
Spec notes: Flow & HP figures are approximate; actual results vary with tune, turbo, CP3 capacity, lift pump, and overall health of the fuel system.
Installation & Tips
- Always install with new connecting/feed tubes and properly torqued high-pressure lines.
- Use a clean fuel system and quality filtration to protect new injectors.
- Consider a healthy CP3 or performance pump to maintain rail pressure under load.
FAQ
Is this injector a direct drop-in for my 2003–2004 5.9L?Yes. It’s built on the Bosch 0986435503 platform for early common-rail 5.9L (2003–2004). Tuning and supporting fuel supply are recommended due to the added flow.
How much power can an R2 support?Industrial Injection rates R2 around 46% over stock with roughly 125 HP potential when properly supported (turbo, CP3, tuning).
Do I need a bigger CP3 or lift pump?For best results, pair with a healthy or upgraded CP3 and a quality lift pump to maintain commanded rail pressure under load. See our CP3 section and fuel system components.
What should I replace during install?At minimum, replace connecting/feed tubes and high-pressure lines, and inspect/replace the valve cover gasket as needed. Our injector install kit bundles the critical hardware.
Is there a core charge?Yes, most reman injectors carry a refundable core charge that’s applied in cart/checkout (amount can vary). See product page/cart for current core details.
