Add-a-Turbo Kit for 6.7 Cummins | Emissions Compatible Compound Turbo | 2007.5–2018 Dodge Ram
The Diesel Power Source® Add-a-Turbo Kit is an emissions-compatible compound turbo upgrade for 2007.5–2018 Dodge Ram 2500 and 3500 trucks with the 6.7L Cummins engine. This kit adds a large S475 atmospheric turbo to your existing factory HE351VE turbocharger, creating a twin turbo system that delivers 250–400°F lower EGTs, up to 2.5x more airflow, and 22–26% more horsepower while retaining your factory exhaust brake, EGR, and DPF.
Unlike the DPS complete compound kits that replace the entire turbo system, the add-a-turbo kit keeps your stock turbo and manifold in place. This means you get compound turbo performance without removing any factory emissions equipment. The kit spools like stock at low RPM, then the S475 atmospheric turbo delivers massive airflow as load increases. It is the cleanest, most OEM-like compound upgrade available for the 6.7 Cummins.
Emissions Compatible: How This Kit Works With Factory Systems
The DPS Add-a-Turbo Kit is designed to work with or without factory emissions equipment intact. The EGR system, DPF, and factory exhaust brake can all remain fully functional when this kit is installed. The kit routes all exhaust through the DPS cast hot pipe from the stock turbo to the S475 atmospheric turbo, then out through the included 4" two-piece downpipe that clamps to the factory exhaust. No cutting, no fabrication, and no emissions components need to be removed or modified.
For trucks that are already deleted, this kit works equally well. But the emissions-compatible design is the primary reason 6.7 Cummins owners choose the add-a-turbo over a complete compound kit or 3rd gen swap — it gives you compound turbo performance without touching your factory systems.
Note: Diesel Power Source® is pursuing CARB certification for this kit. It does not yet have a CARB exemption.
How the Add-a-Turbo Works on a 6.7 Cummins
Your factory HE351VE turbocharger becomes the high-pressure turbo in a compound system. The added S475 atmospheric turbo compresses air first, then feeds that pre-compressed air to your stock turbo, which compresses it again to the final boost pressure. This two-stage compression delivers air that is over 100°F cooler than the stock turbo alone at the same boost level, with boost-to-drive pressure ratios approaching 1:1.
Because your factory turbo handles the initial spool at low RPM, throttle response feels identical to stock. There is no added turbo lag. As RPM and load increase, the S475 picks up the airflow load and the compound effect kicks in, delivering dramatically more air, lower EGTs, and stronger pulling power across the entire RPM range.
Large Turbo Options
| Turbo Option | Compressor | Max HP | Best For |
|---|---|---|---|
| S475 | 75mm compressor, 96mm turbine | ~600 HP | Towing, daily driving, stock to moderate fueling |
| S480 | 80mm compressor, 96mm turbine | ~700 HP | Higher HP builds, aggressive fueling, competition |
The S475 is the standard and most popular choice. It is specifically designed to operate from stock power all the way to 600 HP. For builds beyond 600 HP, upgrade to the S480 for additional airflow headroom. An optional billet compressor wheel with race housing upgrade is available for either turbo (+$200).
A 400 HP truck can expect approximately 95–105 additional HP from the add-a-turbo kit (a 22–26% increase), depending on tune and supporting modifications.
What's Included
- S475 Atmospheric Turbo (or S480 with upgrade)
- DPS cast hot pipe (routes exhaust from stock turbo to S475)
- Support bracket for atmospheric turbo
- High-flow air filter
- 4" two-piece exhaust downpipe (clamps to factory exhaust)
- Kevlar/Nomex lined silicone low-pressure charge pipe
- Polished aluminum high-pressure charge pipe
- Steel braided oil supply lines
- OEM-quality flexible stainless steel oil drain lines
- New wastegate actuator and bracket
- All clamps, bolts, fittings, and installation hardware
- Complete installation instructions
You supply: Your existing factory HE351VE turbocharger (stays in place as the high-pressure turbo).
2007.5–2009 trucks: Stainless piping is provided with the kit for these model years.
2010–2018 trucks: Kit can be used with or without factory emissions intact.
Key Features
- Emissions Compatible — EGR, DPF, and factory exhaust brake all remain functional
- Uses Your Stock Turbo — No turbo replacement needed. Your HE351VE stays in place.
- 250–400°F Lower EGTs — Two-stage compression runs dramatically cooler under load
- 22–26% HP Increase — A 400 HP truck typically gains 95–105 HP
- Up to 2.5x More Airflow — Dual compressors deliver massive air volume improvement
- Spools Like Stock — Your factory turbo handles low-RPM spool. No added lag.
- Retains Factory Exhaust Brake — Your stock VGT exhaust brake continues to function
- Direct Bolt-On — No cutting or fabrication. Clamps to factory exhaust.
- CAD/CAM and CFD Designed — Engineered for OEM-like fit with every component
- All Stainless Steel Tubing — TIG welded for durability
Add-a-Turbo vs Complete Compound Kit vs 3rd Gen Swap
| Feature | Add-a-Turbo Kit (This Product) | Complete Compound Kit | 3rd Gen Swap Kit |
|---|---|---|---|
| Stock Turbo | Keeps factory HE351VE | Replaces with S300 | Replaces with S300 |
| Manifold | Keeps factory manifold | Includes new manifold | Includes new manifold |
| Emissions | Compatible (EGR/DPF intact) | Requires EGR removal | Requires turbo delete programmer |
| Exhaust Brake | Retained (factory VGT) | Optional (Turbonator® VGT) | Optional (Turbonator® VGT) |
| Max HP | ~600–700 HP | Up to 1,100 HP | 530–1,000 HP |
| Best For | Towing, daily driving, emissions-intact trucks | Full overhaul, maximum HP, deleted trucks | VGT replacement, reliability, P003A fix |
| Starting Price | $3,399 | $4,224 | $2,099 |
Fitment
This add-a-turbo kit fits 2007.5–2018 Dodge Ram 2500 and 3500 trucks with the 6.7L Cummins engine and factory HE351VE turbocharger. Select your year at checkout (2007.5–2008, 2009, 2010–2012, or 2013–2018).
This kit works with or without factory emissions equipment. Diesel Power Source® does not provide delete components.
Head studs recommended for boost over 45 PSI. This system is capable of over 60 PSI.
Have a 5.9L truck? DPS makes generation-specific add-a-turbo kits for earlier Cummins platforms:
- Add-a-Turbo Kit for 5.9 Cummins 2003–2007 (3rd Gen)
- Add-a-Turbo Kit for 24V Cummins 1998.5–2002
- Add-a-Turbo Kit for 12V Cummins 1989–1998
Warranty
This Diesel Power Source® add-a-turbo kit is backed by our standard warranty and technical support team.
Related 6.7 Cummins Products
Yes. This kit is designed to work with or without factory emissions equipment. The EGR system, DPF, and factory exhaust brake all remain fully functional. No emissions components need to be removed or modified. This is the key advantage over the complete compound kit and 3rd gen swap kit, which require emissions removal.
Typical gains are 22–26% more horsepower across the RPM range. A 400 HP truck typically gains approximately 95–105 HP. The kit also increases airflow by up to 2.5x and reduces EGTs by 250–400°F. The standard S475 supports up to 600 HP. The S480 upgrade supports up to 700 HP.
The added turbo compresses air first, then your stock turbo compresses it again. This staged compression delivers strong low-rpm response with high-rpm airflow, improving drivability and power while keeping EGTs in check.
The add-a-turbo kit keeps your stock turbo and manifold and adds a large atmospheric turbo. It works with factory emissions and supports up to 600–700 HP. The complete compound kit replaces the entire turbo system with both an S300 and S400 turbo and a new manifold. It supports up to 1,100 HP but requires emissions removal. Choose the add-a-turbo if you want compound performance without touching your factory systems. Choose the complete compound if you want maximum HP and are already deleted.
Yes. Because you keep your factory HE351VE turbocharger, the stock VGT exhaust brake continues to function normally. This is one of the primary advantages of the add-a-turbo approach over the 3rd gen swap or complete compound kits, which replace the factory VGT.
Head studs are recommended for sustained boost over 45 PSI. This compound system is capable of over 60 PSI. Many trucks running the add-a-turbo on stock fueling do not need studs, but they are strongly recommended for builds with increased fueling or sustained high-boost towing applications.
7 Reviews
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Excellent for egt mamagment
I purchased this kit because I was having trouble keeping my egt's in check. My truck has everthing against it for high egt's- big tires, allison swap, highway gearing and high elevation 7,000'+. I havent been able to run this truck without always downshifting(even unloaded) up long grades. This was kinda my last resort. I figured it just needed more air volume but my Cheetah alone wasn't getting it done. The kit was very well engineered and fit like a glove. I also replaced my stock manifold with the high flow DPS manifold. I hesitated to leave a review earlier because I hadn't towed anything yet, but today I hooked up to a 16K trailer and was extremely pleased with how well it performed. EGT's were FINALLY running around 1,000-1100. I would recommend this kit to anyone who is towing or just has their truck turned up. Like the guys in the video said, "you can now let your wife drive your truck" haha. Thank you for an excellent solution to a very long problem I'd been having.
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3rd gen Add a Turbo
I just wanted to let you guys know how much me and my family appreciate the quality and flawless product you put out on the market. I have a 2005 3rd gen cummins with 264k miles on it. I knew it was in need of some freshening up. We pull our camper thru the mountains of Wyoming and also thru kentucky. I spent a few months on the motor of this truck and purchased one of your 3rd gen stocker compound kits. Paired with a mishimoto intercooler. Replaced head gasket while doing the job. Over this passed weekend we pulled the camper on its maiden voyage pulling the camper about 1400 miles round trip thru the hills of south central kentucky and we never had one single issue, never made a noise, never missed a beat and I wasn't nice to it. She just took it and did what it was supposed to. So thank you for that quality work you do. And I will be back to pick up a stock ball bearing turbo to replace the factory turbo. Awesome work!!
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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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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 y'all!
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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.
