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.
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.
