Product Description
Make serious power on your 2003–2004 5.9L Cummins with the Industrial Injection R5 (PN 0986435503SE-R5) remanufactured common-rail injector. This 170% over unit uses EDM/extrude-honed internals, balanced for high-fuel delivery and reliability in competition applications.
Fitment
- 2003–2004 Dodge Ram 2500/3500 — 5.9L Cummins ISB (24-valve common rail, 305 HP)
- Direct replacement for OE Bosch base PN 0986435503 (03–04)
Why It’s Awesome
- 170% over flow (R5) with ~350 HP capability when the fuel system and turbo support it
- Balanced nozzles for consistent cylinder-to-cylinder fueling
- Remanufactured & calibrated to OE-level processes
What You Need To Run It
- Dual CP3s strongly recommended to maintain commanded rail pressure at this flow level
- Custom tuning required to match injector size & turbo airflow
- Use new connector/feed tubes and a fresh valve cover gasket on install
Core & Warranty
- $75 core charge per injector (refundable per supplier policy)
- 1-year, unlimited-mile warranty from Industrial Injection
Specifications
| Manufacturer | Industrial Injection |
| Part Number | 0986435503SE-R5 |
| UPC | 840256901894 |
| Base OE Reference | Bosch 0986435503 (2003–2004) |
| Flow Increase | R5 — 170% over stock |
| Nozzle/Flow | Approx. 65 LPM |
| Recommended Fuel Supply | Dual CP3 system; high-flow lift pump |
| Tuning | Required |
| Emissions | Competition use only; not for on-road vehicles |
| Core Charge | $75 (each) |
| Warranty | 1 year / unlimited miles (manufacturer) |
| Sold As | Each (1 injector) |
Recommended Parts (Internal Links)
- Industrial Injection 237402 Dual CP3 Kit — 2003–2007 5.9L
- CP3 Injection Pumps — 2003–2007 Cummins
- Cummins Connector/Feed Tubes
- Cummins 3954324 Valve Cover Gasket — 2003–2005
- 03–07 Cummins 5.9L Fuel Injectors (Category)
Installation Notes
- Always code injectors and verify no return/excessive leakage.
- Use only Bosch/Cummins OE-spec connector tubes for sealing at the higher rail pressures common with performance setups.
FAQ
Will my stock CP3 support these R5 (170% over) injectors?No. At this size you should plan on a dual CP3 kit and a healthy lift pump to maintain commanded rail pressure.
Are these legal for on-road use?No. These are for dedicated competition use only.
Do I need new connector/feed tubes?Yes—new tubes help prevent sealing issues and protect warranty. See our connector/feed tube options.
What tuning is required?Custom ECM calibration matched to injector size and turbo airflow. Expect significant smoke without proper tuning and air.
What’s the core policy?There is a $75 core charge per injector. Return eligible cores within the stated window for refund. See product page for details.
