Stocker 12v Compound Turbo Kit

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Stocker S475 5.9 Cummins Twin Turbo 1st Gen and 2nd Gen Fits 1989 1990 1991 1992 1992 1994 1995 1996 1997 1998 Year Trucks 12V; *Diesel Power Source 12v Cummins turbo kit where you use your stock K1 H…
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Stocker S475 5.9 Cummins Twin Turbo 1st Gen and 2nd Gen

Fits 1989 1990 1991 1992 1992 1994 1995 1996 1997 1998 Year Trucks 12V;

*Diesel Power Source 12v Cummins turbo kit where you use your stock K1 HX35 HY35 turbo as the small turbo.*

Spools faster than your stock turbo does by itself

Add a Turbo Stocker S475 Turbo Kit for 1st gen and 2nd gen Dodge trucks. Fits 1988-1998 Cummins, excellent Towing compounds for 5.9 cummins 12V

Spools extremely quick and cools EGT’s 250-350 degrees.

Looking for a Full Kit with both turbos?

Choosing Your Kit:

  • Horsepower range: Stock to 600 HP
  • Horsepower Increase: 21%
  • Torque Increase: 23%
  • EGT Reduction: 250-350 degrees
  • Mileage Increase: Same to +1 mpg
  • Smoke Reduction

Features & Benefits of Add a Turbo Kit:

  • Couples right to factory exhaust elbow.
  • Uses stock K1 HX35 HY35 turbo
  • Direct factory-like fit, no cutting.
  • Adjustable wastegate provided, boost adjustable
  • DPS high flow 3-pc, 2nd gen Exhaust Manifold included
  • Includes air intake
  • 4 inch downpipe included (S475 Turbo has 5 inch outlet reduced to 4 inch)
  • Low pressure charge pipe is silicone with Kevlar/Nomex liner (which is easier to fit than a steel tube). Silicone tubing uses fewer clamps and has better flow characteristics than steel.
  • Polished intercooler pipe.
  • Cast hot pipe, will not crack like welded pipe.
  • Flexible Steel braided oil supply lines.
  • S475 large turbocharger (S480 available)
  • Dual Stainless Oil Drain Lines can 'Y' into single port block
  • 3D CAD designed
  • CFD fluid dynamic air designed
  • Pre-tapped pyro ports in manifold
  • Cummins 12V and Cummins 24V require trans cooler relocation kit
  • Dodge Cummins 1st and 2nd compatible

Reasons Why Our 12V Stocker Compounds Work So Well:

  • The air entering the cylinders is cooler, because dual compressors work together within their most efficient zone. The boost air is typically over 100 cooler than from a single turbo.
  • The air entering the cylinder is at higher pressure, bringing the boost pressure and exhaust drive pressures near a 1:1 ratio.
  • The intake stroke can actually produce power.
  • There are additional air molecules in the cylinder which do not get involved in combustion which carry the heat out of the cylinder (similar to how a jet engine is cooler).
  • It has more complete combustion in the cylinders because there’s more air in the cylinder to burn all of the fuel.
  • 1st Gen Compound turbo Kits may require the intercooler charge pipe to be modified.

Lightning Fast Spool-Up. Diesel Power Source, Stocker Twin / Compound Turbo Kit, performs excellent when Racing, Towing, or Sled Pulling, but is so very driveable.

Horsepower, and torque are increased throughout the entire RPM band, and significantly increased in mid and upper range. Typically increases horsepower by 21%-22%. A 400 HP truck will typically gain appx. 90 HP.

Specifically tuned to run from stock horsepower all the way up to 600 horsepower.

Kit includes: Air Filter, Cast Iron Hot Pipe, Support Bracket for S400 Turbo, 3-Piece Exhaust Manifold (pre-tapped ports for pyro), Complete Air Intake including Air Filter, Silicone Low-Pressure Charge Pipe, Aluminum High Pressure Charge Pipe, New wastegate actuator and bracket,1-S475 Turbo (large turbo 75mm compressor wheel/ 96m turbine wheel, 1.32 A/R Housing, when needed, 2-Steel Braided High Temp Oil Supply Lines, 2-Oil Drain Lines & Fittings, Turbo & Manifold Gaskets, Oil Line Adapters, Mounting Bolts, Exhaust Adapter (from S400 to exhaust pipe), V-Band Clamps, High Torque T-Bolt Clamps, Low Torque Clamps, Installation Instructions….and the absolute best customer support on the planet.

EGT TEST RESULTS: The following test results were to test different single turbochargers against our Stocker Compound Turbo Kit. Each test consisted of a sustained 400hp dyno pull. The test truck was brought up to a 400hp on the dyno, and then loaded to hold a sustained loaded pull, equal to pulling a trailer up a grade using 400 hp. The EGT's were read pre-turbo. The results follow:

Test 1 Stock Turbo: Max EGT's reached 1500 degrees, (Test Time: 9 seconds, operator ended test due to excessive EGT's).
Test 3 Diesel Power Source Twin Turbos: Max EGT's reached 1200 (Test Time: 1 minute, EGT's did not ever exceed 1200 degrees).


Question 1: If you already have a competitor’s modified stock turbo (ie. Fleece Performance, Stainless Diesel, BD, Phat Shaft, ATS Diesel) can you use it on this kit.

Answer 1: Yes. give us a call and we can let you know.

** The standard kit includes an S475.

** On 2nd Gen trucks, head studs are highly recommended for boost pressure over 48 psi, and fire rings recommended for boost pressure over 55 psi. This system is capable of well over 55 psi.

***There are a few modifications we have you make to your stock turbo to work with this kit, the modifications will still allow the stock turbo to be used as a stock turbo if you decide to in the future.

Note: On trucks with automatic transmission. The oil cooler on the side of the engine block may need to be either removed or relocated, kit available below.

Free shipping to the lower 48 states. When shipping to anywhere outside of the lower 48 states, additional shipping fees may apply.

  • Compound Kit is Sweet 5

    Posted by Larry Bird on Oct 31, 2023

    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

  • Gday 4

    Posted by Tyler Lee on Jul 16, 2023

    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!

  • Stocker 5

    Posted by R Zep on Jun 5, 2022

    Great compounds,makes towing a breeze with 50# of boost & egt about 300 less now

  • Stocker 5

    Posted by Carl M on May 15, 2021

    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.

  • Stocker Kit for Ram 5

    Posted by Greg Hillerby on Feb 19, 2020

    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.

Stocker 12v Compound Turbo Kit

Stocker 12v Compound Turbo Kit

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Stocker 12v Compound Turbo Kit


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