3rd Gen Cummins Compound Turbo Kits | 2003–2007 5.9 Cummins
From stock power up to 1100 HP, DPS 3rd Gen compound turbo kits fit like OEM and attach directly to the factory exhaust while retaining the factory battery location. Designed for 2003, 2004, 2005, 2006, and 2007 Cummins trucks, these kits provide maximum power and drivability.
Available S300 over S400 Turbo Stages:
- Stage 2.5 – 625 HP: S362/68/.70 over S475
- Stage 3 – 650 HP: S362/68/.70 over S480
- Stage 3.5 – 625 HP: Ball Bearing S362/68/.70 over S475
- Stage 4 – 650 HP: S363/68/.70 over S475
- Stage 4B – 675 HP: S363/68/.70 over S480
- Stage 4.5 – 650 HP: Ball Bearing S363/68/.70 over S475
- Stage 4.5B – 675 HP: Ball Bearing S363/68/.70 over S480
- Stage 5 – 700 HP: S363/73/.80 over S475
- Stage 5.5 – 700 HP: Ball Bearing S363/73/.80 over S475
- Stage 6 – 750 HP: S363/73/.80 over S480
- Stage 6.5 – 750 HP: Ball Bearing S363/73/.80 over S480
- Stage 8 – 1100 HP: S366/73/.80 over S480
- Stage 8.5 – 1100 HP: Ball Bearing S366/73/.80 over S480
How to Choose Your Compound Kit:
- Estimate your horsepower (add ~25% with compounds)
- Select the stage based on your target HP
- Consider adding a Turbonator® VGT for faster spool-up and exhaust braking
- Optional ball bearing upgrade for quicker spool (150–200 RPM faster)
Key Features:
- OEM-like fit — attaches to factory exhaust, keeps battery location
- Wastegated for boost adjustment (except VGT option)
- 3-piece exhaust manifold with pre-tapped pyro ports
- Kevlar/Nomex-lined silicone charge pipe (better flow than steel)
- High-pressure metal charge pipe
- Cast hot pipe for durability
- Flexible steel braided oil lines & stainless drain lines
- Support bracket for large turbo
- Available Turbonator® VGT housing for spool and braking
Performance Benefits:
- Lower EGTs by 250–450°F compared to single turbo
- Increase HP by 22%–30% depending on setup
- Excellent towing performance
Why DPS Compounds Perform:
- Cooler intake air — over 100°F cooler per psi than single turbos
- Near 1:1 boost-to-drive pressure for efficient combustion
- More complete fuel burn = cleaner exhaust
- CAD/CAM & CFD tested for factory-like fit and performance
Kit Includes:
- Both S300 and S400 turbos (except add-a-turbo)
- 3-piece exhaust manifold
- Air, oil, and exhaust tubing
- Exhaust adapter for factory exhaust connection
Installation Notes:
Head studs recommended for 55+ PSI boost, fire rings for 65+ PSI. Kits are adjustable and capable of over 55 PSI. These kits do not have a CARB exemption; however, our exhaust manifolds do.
Need a 1st Gen Compound Kit or 2nd Gen Compound Kit? Check out our options!
It’s a twin-turbo system that adds a larger atmospheric turbo in front of your stock turbo. The added turbo feeds low-pressure air, the stock turbo adds high-pressure boost. Result: lower EGTs, stronger mid-range, and room for more horsepower on 2003–2007 Ram 2500/3500 trucks.
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Yes. Many owners start with the stock high-pressure turbo, then move to the DPS Turbonator® VGT for quicker spool, stronger braking capability with the appropriate controller, and more headroom while staying fully compatible with the compound setup.
Yes. Compounds shine under load. Expect cooler EGTs on long grades and better temperature control while hauling.
