Exergy 03-07 Dodge Cummins 5.9L 550 Alpha Stroker CP3 Pump (6.7C Based)
The Exergy 550 Alpha is the CP3 you buy when a 2003-2007 Dodge Ram 2500 or 3500 with the 5.9L common-rail Cummins is being built to rev. It is aimed at trucks where rail pressure falls away at the top of the tach: big injectors, a high-RPM tune, and a pump that simply runs out of volume past 4000 RPM. If your truck is a daily driver with a mild tune, this is more pump than you need, and the rest of this page explains why.
On the 2003-2007 5.9, the CP3 is the gear-driven high-pressure pump that fills the common rail. The lift pump feeds it low-pressure fuel, a gear pump inside the CP3 pressurizes that supply, and three plungers push it up to rail pressure. An inlet metering valve (the MPROP) controls how much fuel the plungers get, which is how the engine computer holds a target rail pressure. When the injectors demand more fuel than the plungers can deliver, rail pressure sags and power goes with it.
Exergy built the 550 Alpha on its 14mm stroker design and says it carries the output curve about 1000 RPM farther than earlier stroker CP3s, peaking at 550 liters per hour. That is why it is pitched at race trucks that spin beyond 4500 RPM. It uses Exergy's own MPROP and pressure-regulator design, and because it is a 6.7C-based pump body, it does not bolt up to your supply line the same way the factory 5.9 pump does.
Do not treat a pump as the fix until the supply side is proven. Log commanded versus actual rail pressure on a full pull, and put a gauge on the lift pump feed at the same time. If feed pressure drops first, the CP3 is being starved and a new pump will not cure it. Check filters, the pressure relief valve and injector return before blaming the pump. A truck that only feels weak at the top end may also be a transmission problem: on these Rams a slipping 48RE feels like lost power, so read our 48RE slipping under load guide and rule that out first.
This listing is for 2003-2007 Dodge Ram 2500 and 3500 trucks with the 5.9L common-rail Cummins, part number E04 20010. Exergy lists it under both the early 5.9 (2003-2004) and late 5.9 (2004.5-2007) pump categories. Because it is 6.7C-based, plan a different supply line: the original supply port is plugged, and fuel is fed into the billet gear pump housing at the port marked Inlet. Exergy notes that plug should never be removed. If you are unsure which 5.9 you have, send us the year and VIN before ordering.
Big fuel makes big torque, and the factory automatic is usually the next thing to fail. Read our 48RE upgrade guide before you turn the tune up. If your build tops out below race RPM, compare the Exergy 14mm Race Series CP3 or the 10mm stroker CP3. All of our 5.9 Cummins fuel parts are under engine performance.
| Brand | Exergy |
| Part number | E04 20010 |
| Fits | Exergy 03-07 Dodge Cummins 5.9L 550 Alpha Stroker CP3 Pump (6.7C Based) |
| Vehicle fitment | Dodge Cummins (2003-2007) |
| Type | Injection Pumps & Controllers |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Yes. It is listed for 2003-2007 Dodge Ram 2500 and 3500 with the 5.9L common-rail Cummins, covering both the early and late 5.9. It is a 6.7C-based pump, so the fuel supply line has to be changed to feed the Inlet port on the gear pump housing.
Exergy states a primary fuel supply of 200 GPH at 15 psi per pump for maximum performance. A factory or small aftermarket lift pump will not feed it at full output.
Yes. Exergy says custom tuning and supporting modifications are required. The pump uses its own MPROP and regulator design, and the engine computer needs calibration to control it properly.
Only if the engine spends time above 4500 RPM. The 550 Alpha is built on the 14mm stroker design but carries its output curve about 1000 RPM higher. A truck that shifts earlier is usually better served by the 14mm or 10mm stroker.
No. Exergy notes the original supply port is plugged and that the plug should never be removed. Fuel is fed into the port labeled Inlet.
