Add A Turbo Kit 6.7 Cummins Twin Turbo Using Stock Turbo – S475 Over Stock Cummins
Fits 2007–2018 Dodge Ram 6.7L Cummins Trucks
*EGR, DPF, and exhaust brake can remain intact if desired*
The Diesel Power Source Add A Turbo Kit for the 6.7 Cummins is a twin turbo system using your stock turbo. It delivers the best balance of towing power, low EGTs, and all-around performance. This S475 over stock Cummins twin kit works perfectly with or without factory emissions.
The system spools like stock while lowering EGTs by 250–400 degrees. Airflow is improved by nearly three times, resulting in cooler, cleaner, and more efficient combustion.
The DPS Add A Turbo Kit includes everything you need for installation. It offers quick low-end response, strong top-end power, and very cool EGTs — truly the best of all worlds.
Features & Benefits
- Works with or without factory emissions.
- Direct bolt-on — no fabrication required.
- Clamps to factory exhaust with DPS cast hot pipe.
- Includes large high-flow air filter and 4" two-piece downpipe for easier install.
- Low-pressure charge pipe made of silicone with Kevlar/Nomex liner.
- Uses stock HE351VE turbo and retains factory exhaust brake.
- Support bracket for S400 turbo included.
- Flexible braided oil supply lines and OEM-quality drain lines.
- S475 turbocharger (S400 frame with 75mm compressor wheel).
- Optional upgrades: S480 or S483 (call for details).
- Increases power by 22% or more with lightning-fast spool-up.
The DPS Twin Turbo S475 over stock Cummins kit performs exceptionally for racing, towing, and sled pulling while remaining smooth and driveable. Expect EGT reductions of 250–400°F and a horsepower increase of 22–26%. A 400 HP truck typically gains 95–105 HP.
This system runs cool, clean, and powerful — designed to perform from stock power levels up to 600 HP. For builds beyond 600 HP, upgrade to the S480 turbo (recommended for up to 700 HP).
Advanced Engineering
This kit was engineered using cutting-edge CAD/CAM software and CFD (Computational Fluid Dynamics) testing. Every component fits like a factory system and works with or without emissions intact.
Kit Includes
- Air filter
- Exclusive cast hot pipe
- Support bracket for S400 turbo
- New air intake tubing
- Low-pressure charge pipe
- 1 × S475 turbo (75mm compressor / 96mm turbine / 1.32 A/R housing)
- Steel braided high-temp oil supply lines
- All coolant and A/C relocation lines
- Stainless steel exhaust tubing (TIG-welded)
- Flex oil drain line
- All gaskets, fittings, bolts, nuts, and clamps
- Heat wrap
Note: This kit allows you to use your stock HE351VE turbocharger.
Why DPS Compound Turbos Work So Well
- Dual compressors operate efficiently together, producing boost air over 100°F cooler than a single turbo.
- Boost and exhaust drive pressures approach a 1:1 ratio, allowing the intake stroke to contribute power.
- Higher cylinder pressure increases oxygen density and improves combustion efficiency.
- Cooler air carries more molecules through the engine, reducing heat and improving reliability.
- More air means more complete fuel burn, resulting in smoother power and cleaner exhaust.
Additional Notes
- The standard kit includes the S475 turbo. (Upgrades to 80mm or 83mm wheels available.)
- Capable of over 60 PSI — head studs recommended for boost above 45 PSI.
- Kits for 2010–2018 models include a coolant reservoir.
- Emission-friendly design. CARB certification pending.
5 Reviews
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Gday
Great choice for an aftermarket turbo, or even compounds! My DPS add on turbo kit is amazing, completely changed the truck, from EGTs, to spool and psi. Completely recommend yall!
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Compound Kit is Sweet
Not that Larry Bird. Your Add A Turbo Kit for my 2012 made a huge improvement on towing with my truck. Great power and helped with my EGT temps. Once the stock turbo goes out I plan to upgrade with the Turbonator. Thanks for making a great fitting kit
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Stocker
Great compounds,makes towing a breeze with 50# of boost & egt about 300 less now
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Stocker
I bought this add a turbo kit for my 2005 Cummins and what a difference it made towing. I live in the west and travel some good mountain passes with a travel trailer. No issues with the EGTs and no down shifting. I already want to replace my stock turbo for their Turbonator turbo. Great kit! and everything came in it to install.
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Stocker Kit for Ram
I don't normally comment on my truck part purchases, but I felt the quality of your kit was worth taking the time for. I recently purchased one of your stocker / S475 kits for my 06 ram. I have to say I am very impressed with the quality and packaging you guys do. This is my first compound turbo set up. I looked at many kits before purchasing yours. I looked at cheaper and more expensive. I had nearly talked myself into buying a cheaper kit. After receiving your kit I was immediately satisfied with spending the extra money on it. I opened the kit and was very impressed with the packaging alone. I thought to myself, if it performs half as well as it's packaged, I was going to be very happy. I had one issue after installation, but it turned out to be my fault for assuming. I assumed the tube from the output of the S475 to the input of my stock turbo was molded to the connector that uses V band clamp onto the S475. I had one extra clamp once installed and I thought it was odd, however I took the truck for it's test ride and was very impressed with the faster spool up but the system got very loud and not as much boost as I had anticipated. I found out very quickly where the extra clamp went. After that mistake was remedied The system is performing flawlessly. I am very satisfied with this kit. I look forward to putting it to the test towing in the Colorado mountains. I will be purchasing your intake for this same truck as well as probably upgrading my stock turbo to one of your new ball bearing turbos in the near future. I will not hesitate to recommend you guys to anyone who asks.
