Add-A-Turbo Kits
Add-A-Turbo (Stocker) Compound Kits for Cummins
Keep your stock turbo and add a larger S475 or S480 in front of it.
An Add-A-Turbo kit, also called a stocker kit, turns your factory turbo into the small turbo of a compound setup. You get the benefits of compounds with only one new turbo to buy.
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A Diesel Power Source® Add-A-Turbo kit keeps your factory turbo and adds a much larger DPS turbo in front of it. The new turbo feeds compressed air to the factory turbo, so the factory turbo becomes the high-pressure stage of a compound system. Because only one new turbo is included, you get compound airflow, lower EGTs, and stronger towing for less than a full compound kit, and you keep a path to a full compound kit later.
The factory turbo stays in place and becomes the small turbo
S475/96/1.32 standard, S480/96/1.32 for larger builds
Two turbos share the work for more air and lower EGTs
Move to a full compound kit later if your build grows
Large Turbo Sizes
| Large Turbo | HP Range (RWHP) | Pair It With |
|---|---|---|
| S475/96/1.32 (75mm) | Stock to 600 | A factory turbo or a small turbo with a 64mm or smaller compressor wheel, such as the HE360VG or HE363VG |
| S480/96/1.32 (80mm) | 600 to 700 | A small turbo with a 66mm or larger compressor wheel, such as the HE366VG or a DPS S366 |
HP figures are approximate rear wheel horsepower and vary with tuning, fueling, and supporting modifications. A larger small turbo needs a larger second-stage turbo to work well with it.
What's in the Kit
- The large DPS turbo (S475 or S480)
- All piping and hardware needed to connect it to your factory turbo
- DPS exhaust manifold on 5.9L kits
- DPS patented cast hot pipe on 2010-2018 6.7L kits. One casting routes exhaust from the factory turbo outlet to the large turbo and back to the factory downpipe, and it will not crack like welded pipe.
You supply: your factory turbo, in good working condition.
Fitment
- 1994-1998 Dodge Cummins 5.9L 12V
- 1998.5-2002 Dodge Cummins 5.9L 24V
- 2003-2007 Dodge Cummins 5.9L common rail
- 2007.5-2018 Dodge Cummins 6.7L (factory HE351VE on 2007.5-2012, factory HE300VG on 2013-2018)
- 6.7L piping is different by year: the 2007.5-2009 kit is for deleted trucks only, and the 2010-2018 kit uses the cast hot pipe.
Good to Know
- The factory turbo needs to be in good shape. A worn turbo should be replaced before adding a second turbo.
- On 5.9L kits, install the adapter and spacer on the exhaust side of the factory turbo as shown in the instructions. Without the spacer, the large turbo will not swing into position.
- Diesel Power Source® does not sell emissions delete components.
- Tuning is the owner's responsibility. DPS does not sell tuners or tuning.
Want both turbos new instead? See the complete Cummins compound turbo kits, which include the high-pressure turbo, the atmospheric turbo, the manifold, piping, and hardware.
Related categories:Compound Turbo Kits | HE-Series VGT Turbos | S300 Single Turbos | S400 Single Turbos | Exhaust Manifolds. Not sure which size fits? Use the Turbo Selector or call 801-930-8404. Free shipping on orders over $350.
Cummins is a registered trademark of Cummins Inc. Diesel Power Source® is not affiliated with Cummins Inc.
Frequently Asked Questions
What is an Add-A-Turbo kit?
It is a compound turbo kit that keeps your factory turbo and adds a much larger DPS turbo in front of it. The new turbo turbocharges the factory turbo, so you get the benefits of compounds with only one new turbo. It is also called a stocker kit because it is built around the stock turbo.
Can I keep my stock turbo?
Yes. That is what the kit is designed for. Your factory turbo stays in place and becomes the small, high-pressure turbo. It should be in good working condition. If it is worn, replace it first.
Which large turbo comes in the kit?
Almost all DPS Add-A-Turbo kits come with an S475/96/1.32, matched from stock power to about 600 RWHP. The S480/96/1.32 is the upgrade for builds from about 600 to 700 RWHP. If your small turbo has a 64mm or smaller compressor wheel, the S475 works well. If it has a 66mm or larger wheel, DPS recommends the S480.
Does the 6.7L kit keep my emissions equipment and exhaust brake?
The 2010-2018 6.7L kit keeps the factory turbo, manifold, and exhaust brake, and it is built to work with the factory emissions equipment. The 2007.5-2009 kit is for deleted trucks only. Diesel Power Source® does not sell emissions delete components.
What is included, and what do I supply?
The kit includes the large turbo, piping, and hardware. 5.9L kits also include a DPS exhaust manifold, and 2010-2018 6.7L kits include the DPS patented cast hot pipe. You supply your factory turbo.
Can I upgrade to a full compound kit later?
Yes. An Add-A-Turbo kit leaves a path to a full compound kit when you are ready to replace the small turbo.
Why won't the large turbo fit into position on my 5.9L?
On 5.9L kits, an adapter and spacer go on the exhaust side of the factory turbo, between the turbo and the hot pipe. Factory 5.9L turbos are shorter than the turbo the piping was designed around, so the spacer sets the right distance. If the hot pipe is connected straight to the factory turbo, the large turbo will not swing in far enough or will hit the shock tower. Install the spacer and adapter with the V-band clamps as shown in the instructions.