Compounds - First Gen & Second Gen 12 Valve Cummins Twin Turbo Kit
Fits: 1989–1998 12 Valve Cummins
Boost Your 12 Valve Cummins Performance
From stock horsepower all the way up to 1300 HP, this compound turbo kit delivers unmatched gains across the board.
Compound Turbo Kit Options
Stage 2.5 Max 625hp S362/68/.70 over S475
Stage 3 Max 650hp S362/68/.70 over S480
Stage 3.5 Max 625hp S362/68/.70 Ball Bearing over S475
Stage 4 Max 650hp S363/68/.70 over S475
Stage 4B Max 675hp S363/68/.70 over S480
Stage 4.5 Max 650hp S363/68/.70 Ball Bearing over S475
Stage 4.5B Max 675hp S363/68/.70 Ball Bearing over S480
Stage 5 Max 700hp S363/73/.80 over S475
Stage 5.5 Max 700hp S363/73/.80 Ball Bearing over S475
Stage 6 Max 750hp S363/73/.80 over S480
Stage 6.5 Max 750hp S363/73/.80 Ball Bearing over S480
Stage 8 Max 1100hp S366/73/.80 over S480
Stage 8.5 Max 1100hp S366/73/.80 Ball Bearing over S480
Key Features & Benefits
- Factory-like fit – no cutting or fabrication needed
- Wastegated design for precise boost control
- High-performance 3-piece exhaust manifold
- High-flow air filter
- Kevlar/Nomex lined silicone charge pipes
- Durable metal high-pressure charge pipe
- Cast hot pipe (not thin welded steel)
- Braided steel oil supply & stainless oil drain lines
- Includes S300 & S400 Borg Warner turbos
- Optional ball bearing turbo for faster spool
- Integrated turbo support brackets
- Drops EGTs by 250–450°F
- Increases power by 22%–30%
- Ideal for towing applications
- Designed and tested using CFD software
- The only company offering compound kits for 1st Gen Cummins
Why Our Compound Kits Outperform the Rest
- Twin compressors operate within optimal efficiency zones
- Cooler intake temps = more air density per PSI
- Intake stroke contributes to power generation
- Extra air molecules absorb and carry away heat
- More complete combustion = cleaner, stronger power
All Diesel Power Source kits are CAD-designed, CFD-tested, and precision-engineered for a perfect OEM-style fit with extreme performance.
What's Included
- Both S300 and S400 turbos
- Exhaust manifold
- Air, oil, and exhaust tubing
- Intake and filter
- Downpipe or OEM exhaust adapter (varies by truck)
Note: These kits do NOT have a CARB exemption. However, our exhaust manifolds do.
Check out our Fummins and Chummins kits for more conversion options.
- S362/68 over S475 - Max 625hp- Stg 2.5
- S362/68 over S480 - Max 650hp- Stg 3
- S362/68 Ball Bearing over S475- Max 625hp - Stg 3.5
- S363/68 over S475 - Max 650hp- Stg 4
- S363/68 over S480 - Max 675hp- Stg 4B
- S363/68 Ball Bearing over S475 - Max 650hp - Stg 4.5
- S363/68 Ball Bearing over S480 - Max 675hp - Stg 4.5B
- S363/73 over S475 - Max 700hp - Stg 5
- S363/73 Ball Bearing over S475 - Max 700hp - Stg 5.5
- S363/73 over S480 - Max 750hp - Stg 6
- S363/73 Ball Bearing over S480- Max 750hp- Stg 6.5
- S366/73 over S480 - Max 1100hp - Stg 8
- S366/73 Ball Bearing over S480- Max 1100hp - Stg 8.5
It’s a twin-turbo system that adds a larger atmospheric turbo in front of your stock turbo. The big turbo handles low-pressure compression and your stock turbo makes high-pressure boost. The result is lower EGTs, stronger mid-range, and clear headroom for horsepower on 1989–1998 Ram 2500/3500 trucks.
Faster spool than a single big turbo, cooler EGTs while towing, stronger mid-range torque, and a clean path to higher horsepower with fueling changes. Results depend on calibration, fuel, altitude, and engine health.
You can start mild on stock injectors. For more power, common steps are VE fuel pin and governor springs, or on P-pump trucks AFC adjustments, delivery valves, timing changes, larger injectors, and a higher-flow lift pump/CP3 conversion as goals rise. Work with a tuner who knows compounds.
No. You keep the stock turbo’s quick response. The added turbo supplies airflow as load rises, so you gain top-end without giving up drivability.
6 Reviews
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The best
Impressed w my twins turbos
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Compound Setup
I have had your stage 2.5 compound setup on my 97 12 valve for a year now and I can say I am very impressed with how that really woke it up. 5x16 injectors and pump work, and 22 deg timing and can hold her to the floor with max fuel and the egts never go over 1100.
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5.9 Compounds
I had the compound kit on my 5.9 Cummins for 4 years now. It made a huge difference in towing trailers. It spools up quick for when I need to get the camper or the trailer moving from a stop. Also, it does not take a lot of effort to make a pass on someone when I'm in a hurry. I would recommend this kit to anyone, whether they want to play or work.
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Hello, I
Hello,I do not 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 is 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 a 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.
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Towing
Best thing I could have done sooner was do compounds for my 6.7Cummins! Stock fuel with some items not on the truck and it tows awesome. Steep grades and EGTs issues are a thing of the past! Great kit
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98 12V
Hey fellas, did some upgrades after your compound set up. Hamilton stage 1 head, full manual valve body, 125 industrial injectors. Makes 683 hp and just under 1300tq at 7200 ft. Egts never get over 1100 no matter what I’m pulling or how I have my attitude adjusted. Tuned by grand by truck shop. This thing is a pulling beast. Thanks again.Â
