5.9 Cummins
5.9L Cummins Performance Parts & Turbo Upgrades
Looking to upgrade your 5.9L Cummins (1989–2007)? Diesel Power Source offers Compound Turbo Systems, Single Turbo Upgrades, and High-Flow Exhaust Manifolds built to increase horsepower, lower EGTs, improve spool, and make towing more reliable across every 5.9 generation.
The 5.9L Cummins B-series powered Dodge Ram pickups from 1989 through 2007 in three meaningfully different forms — the mechanical 12V (1989–1998), the electronic 24V (1998.5–2002), and the 5.9 Common Rail (2003–2007). Whether you have a P-pump 12V build, a daily-driver 24V, or a Common Rail tow rig, our Cummins turbo upgrades are engineered for real-world results. From compound turbo kits and S300/S400 single turbo upgrades to multi-piece exhaust manifolds, we manufacture the parts you need to get more out of every 5.9 generation.
Popular 5.9 Cummins Performance Upgrades
- 5.9 Cummins Compound Turbo Kits (Lower EGTs & widen the powerband)
- High-Flow 5.9 Exhaust Manifolds (Reduce backpressure & resist cracking)
- S300 Single Turbo Upgrades (Quick spool, balanced street performance)
- S400 Single Turbo Upgrades (Higher airflow for elevated fueling)
- 5.9 12V 1988–1993 Performance Parts
- 5.9 12V 1994–1998 Performance Parts
- 5.9 24V 1998.5–2002 Performance Parts
- 3rd Gen 5.9 Common Rail (2003–2007) Performance Parts
From compound turbo kits and S300/S400 single turbos to multi-piece exhaust manifolds and install hardware, Diesel Power Source engineers clean-fit, durable solutions for every 5.9 Cummins build. Lower your EGTs 200-300°F, improve throttle response, and protect your engine for the long haul.
200-300°F Cooler EGTs
Better combustion and lower drive pressure under load
Quicker Spool & Response
Stronger low-end torque and better passing power
Crack-Resistant Manifolds
Multi-piece HSMD castings absorb thermal stress
Made in the USA
Engineered, manufactured, and supported in Utah
Shop by 5.9 Cummins Generation
- 5.9 12V (1988–1993) — 1st gen with Bosch VE rotary pump; the original Dodge Cummins
- 5.9 12V (1994–1998) — 2nd gen with the legendary Bosch P7100 inline pump
- 5.9 24V (1998.5–2002) — Four valves per cylinder with electronic VP44 injection
- 5.9 Common Rail (2003–2007) — 23,000 PSI common rail injection, the most powerful 5.9
- S300 Single Turbos — 62-69mm compressor options for daily and tow builds
- S400 Single Turbos — 72-88mm compressor for high-power and atmospheric duty
- Compound Turbo Kits — Two-stage setups with the biggest EGT drops in the lineup
Why Upgrade Your 5.9 Cummins with Diesel Power Source Parts
More Power and Torque
Higher-flow turbos and free-flowing manifolds let the engine breathe properly. Acceleration improves, towing gets stronger, and you hold speed on grades without burying the throttle.
Cooler EGTs Under Load
Compound turbo kits drop EGTs 200-400°F by improving combustion efficiency and pulling heat out of the cylinder. Critical for towing in the mountains, in heat, or on bigger tires.
Manifolds That Last
Our multi-piece HSMD ductile iron manifolds use expansion joints to absorb thermal stress. They don’t crack like single-piece factory and competitor manifolds, and they pressure-test leak-free at every shipment.
Engineered, Not Resold
We design and manufacture every turbo and manifold in our Utah facility. CFD-tested for flow, validated on the dyno, and supported by the engineers who built them.
How to Choose the Right 5.9 Upgrade Path
Towing & Daily
Stock-replacement T3 manifolds paired with an S362 or S363 single turbo, or a small compound kit (S362/S475). Quick spool, 150-200°F cooler EGTs, no compromise on street manners.
Street Performance
S366 or S369 single turbos, or compound kits in the S363/73 over S475-S480 range. Stronger midrange and top-end with the EGT control to back it up. Best balance of fun and usable power.
High-Power Builds
S366 or S369 over S480 compound configurations. Plan supporting mods: head studs above 45-55 PSI boost, transmission upgrades around 400 RWHP, fuel system upgrades around 500-550 RWHP, aftermarket rods near 800 RWHP.
Fitment Checklist
- ✓ Confirm engine year and generation (12V, 24V, or 5.9 CR) before ordering
- ✓ Verify turbo flange (T3 for stock-style, T4 for aftermarket compound builds)
- ✓ Notify us at order time if you have aftermarket intercooler piping (Mishimoto, Banks, etc.)
- ✓ Plan supporting items: gaskets, hardware, oil drain lines, monitoring ports
Install & First-Drive Notes
- • Use new gaskets and quality hardware; torque in sequence on a cold engine
- • Pressure-test the charge-air system before first start; verify no pre-turbine leaks
- • Monitor boost, EGT, and (if equipped) drive pressure on initial towing runs
- • Re-torque manifold fasteners after heat cycles per the install instructions
Ready to compare options? Visit 5.9 Cummins Manifolds, Compound Turbo Kits, or jump to your specific generation: 12V (1994-1998), 24V (1998.5-2002), or 5.9 CR (2003-2007).
5.9L Cummins FAQs
The 12V (1989-1998) has 12 valves - two per cylinder - and uses a fully mechanical fuel injection pump (Bosch VE in 1989-1993, the legendary Bosch P7100 inline pump in 1994-1998). The 24V (1998.5+) has 24 valves — four per cylinder — and uses an electronically controlled injection pump (VP44 in 24V trucks, common rail injectors from 2003 forward). The 12V is mechanically simpler and the favorite for high-horsepower builds because of its rod strength. The 24V offers more refinement, better breathing, and easier electronic tuning.
The factory bottom end on a 12V or early 24V Cummins reliably handles approximately 800 RWHP on stock rod bolts. With ARP rod bolts, street builds up to approximately 1,000 RWHP are common - these rods bend rather than snap. The 5.9 Common Rail (2003-2007) uses fractured-cap rods that are safer to approximately 650-800 RWHP for street use, with aftermarket rods becoming the smart choice beyond that. Note: head studs and head gaskets are typically the first upgrade needed at boost levels above 45-55 PSI depending on the year, and the transmission usually needs attention around 400 RWHP.
Yes. One of the most common misconceptions about compound turbos is that they're only for high-horsepower builds. Many of our customers run compound kits on completely stock fuel with zero other modifications. Properly sized for the engine, a compound kit improves combustion efficiency, drops EGTs by 200-400°F, improves towing performance, and often improves fuel economy - all on stock fueling. The compound advantage isn't just "more power" - it's the engine working the way it was designed to.
