Designed for tractors and vocational trucks that see long grades, high ambient temps, and continuous load, DPS ISX manifolds prioritize durability and serviceability. Optimized runner geometry and a robust divider/collector help reduce drive pressure and improve pulse energy to the turbine, supporting cleaner combustion under sustained load.
Why upgrade your ISX15 manifold
- Lower drive pressure & EGT: Flow-efficient runners reduce pumping losses during long pulls and heavy GCW routes.
- Turbo protection: Stable pulses and improved sealing help protect CHRA bearings and seals over long duty cycles.
- Thermal stability: High-nickel, thick-wall casting resists cracking and flange warpage from repeated heat cycles.
- Service friendly: Flat, machined faces and correct hardware locations support predictable gasket crush and quicker turnarounds.
Fitment
Applications include Cummins ISX15 and X15 engine families such as CM570, CM871, CM2250, CM2350 (and select X15 variants). Verify engine family/ECM label, emissions package (EGR/DPF/SCR), turbo flange style, and chassis clearances on the individual product pages before ordering.
Construction details that matter for fleets
- High-nickel thick-wall cast: Resists thermal fatigue and cracking in high-heat cycles.
- Precision-machined flanges: Flat sealing surfaces at head and turbo reduce leaks and re-torque events.
- Reinforced divider & collector: Supports stable pulse energy and long-term structural integrity.
Choosing the right ISX manifold
- OE-style replacement: For fleets targeting reduced backpressure and improved sealing with stock-like packaging.
- Enhanced-flow configuration: For routes with sustained grade load and high ambient temperatures where extra thermal headroom is valuable.
Install & operations notes
- Use new gaskets and recommended hardware; follow torque sequence on a cold engine and re-check if specified after heat cycles.
- Inspect turbo mounting face and clamp integrity; correct any upstream exhaust leaks that can skew sensor data and EGR strategy.
- Pressure-test CAC system and confirm MAP/DPF differential sensor health during post-install shakedown.
Building a full solution? See ISX15 Conversion Kits for turbo & plumbing conversion packages, or ISX Turbocharger Kits for single-turbo packages. Return to this page for manifold-only solutions.
Frequently asked questions
How do I confirm my ISX engine family (CM871, CM2250, CM2350, etc.)
Check the engine data tag for ESN. Selecting the correct family ensures flange pattern, sensor routing, and bracket alignment match the manifold you purchase.
Will an upgraded manifold affect emissions equipment
DPS manifolds are designed for the specified ISX/X15 families. When installed with compatible components and procedures, trucks can retain factory emissions systems. Always follow applicable regulations and fleet policy.
Do I need calibration changes after a manifold upgrade
Most fleets do not require calibration for a manifold alone. If other airflow/fueling changes are present, consult your calibration provider regarding boost/drive targets and regen strategy.
What operational gains should I expect
Typical goals are steadier grade speed, reduced drive pressure/EGT under sustained load, and improved sealing reliability over long intervals. Results vary with GCW, route profile, altitude, and ambient temps.
What maintenance extends manifold and turbo life
Maintain OEM-spec oil and intervals, keep air filtration and CAC systems leak-free, verify sensor accuracy, and investigate any pre-turbine leak or soot trace promptly.
