Fummins Compound Turbo Kits: The Ultimate Ford Cummins Conversion Upgrade
Posted by DB on May 20, 2025
Fummins Compound Turbo Kits: The Best Twin Turbo Upgrade for Your Ford Cummins Swap
Looking to turn your Ford into a diesel powerhouse? At Diesel Power Source, we offer engineered solutions for Ford Cummins swaps—known as Fummins conversions. Our industry-leading S480/S300 compound turbo kits are designed for high performance, low EGTs, and an OEM-like fit for Ford trucks from 1970 to 1998.
What Is a Fummins Conversion?
A “Fummins” is a Ford truck powered by a Cummins engine. Enthusiasts often choose this swap for the combination of Ford chassis strength and Cummins diesel reliability. Whether you're converting an OBS Ford, Excursion, or Super Duty, our turbo systems bring your build to life.
Why Choose a Compound Turbo Setup?
Our S480/S300 compound turbo kits are designed to offer the best of both worlds: fast spool-up from the smaller S300 and massive top-end power from the larger S480 or upgraded S481. This dual turbo setup creates cooler, denser air—lowering EGTs and significantly increasing horsepower.
Benefits of DPS Compound Turbo Kits:
- Up to 1100+ HP potential
- Lower EGTs by 250–450°F
- 25–30% horsepower increase
- CAD-designed & CFD-tested for maximum flow
- Bolt-on fitment with no fabrication required
- Ideal for towing, racing, or daily driving
Why Our Fummins Kits Stand Out
Our Fummins kits are not universal—they’re designed specifically to clear Ford heater cores and fit seamlessly into OBS and pre-1998 chassis. You get a true drop-in experience without compromises.
Each Kit Includes:
- DPS small turbo and Borg Warner S475 or S480/S481
- 3-piece high-flow exhaust manifold with pre-tapped pyro ports
- Cast hot pipe and braided oil lines
- Silicone charge pipes and massive air filter
- All clamps, gaskets, and install hardware
What Trucks Does It Fit?
Our Fummins turbo kits fit Ford trucks from 1970 to 1998, including:
- OBS Ford Cummins swaps
- Cummins-powered Excursions
- Classic Ford Cummins conversions
Choosing the Right Stage
We offer multiple horsepower stages, from 625 HP to 1100+ HP. Pick the stage based on your power goals and driving style. All kits use our proven S300 high-pressure turbo and your choice of S475 or S480/481 low-pressure turbo.
Head Studs & Fire Ring Recommendations
If you're running more than 48 psi of boost, we recommend head studs. For over 55 psi, use fire rings for added sealing. Our kits are capable of 55+ psi, but they’re adjustable for your build.
Why Diesel Power Source?
We’re the only company offering drop-in 1st Gen Cummins compound kits and purpose-built Fummins turbo systems. With decades of experience and a reputation for unmatched quality, we’re your trusted source for compound turbo technology.
Get Started Today
Explore the links below to take the next step:
Build it right. Build it powerful. Build it with Diesel Power Source.