The Diesel Power Source ISX15 manifold is engineered for demanding commercial duty. Thick-wall, high-nickel cast construction and precision-machined flanges provide thermal stability, reliable sealing, and efficient exhaust flow to help control EGT and support turbo life on Cummins ISX and X15 platforms.
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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.
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.
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.
A high-flow ISX15/X15 exhaust manifold improves exhaust gas distribution to the turbocharger, reducing drive pressure and helping control EGTs during sustained load. Compared to factory manifolds, performance designs support steadier boost, better grade-pulling consistency, and improved long-term sealing reliability for heavy-duty and high-mileage applications.
Yes. Diesel Power Source ISX15 and X15 exhaust manifolds are engineered for specific engine families such as CM871, CM2250, and CM2350. When the correct manifold is matched to the engine family and installed properly, trucks can retain factory emissions equipment while benefiting from improved airflow and reduced exhaust restriction.
In most cases, a manifold upgrade alone does not require calibration changes. Many fleets and owner-operators see reduced drive pressure, cooler EGTs, and more consistent pulling power under load without altering the engine tune. If additional airflow or fueling modifications are present, calibration review may be appropriate to optimize boost and regeneration behavior.
If you’re looking for dependable ISX or ISX15 exhaust manifolds, you want parts that are built for heavy use, engineered to fit right, and backed by real support. You can find high-quality options through specialty diesel performance shops and aftermarket manufacturers that focus specifically on Cummins engines. At Diesel Power Source, we offer exhaust manifolds that are designed with strength, longevity, and real-world performance in mind. Our manifolds are made from thick, durable castings and go through stringent quality checks before they reach you. That means less worry about cracks, leaks, or premature failure compared with stock units or low-cost replicas. Diesel Power Source manifolds are a great option because they’re built by people who understand what ISX and ISX15 engines go through day in and day out. Whether you’re replacing a worn-out OEM piece or upgrading for better performance, our manifolds deliver reliability, fitment you can trust, and performance gains without sacrificing durability.
Yes, you can absolutely upgrade your Cummins ISX exhaust manifold for better performance. Upgrading to a higher-quality manifold can improve exhaust flow, reduce backpressure, and help your turbo work more efficiently. That translates into more consistent power delivery, better throttle response, and sometimes improved fuel economy, especially under load. Choosing an upgraded manifold also reduces the chance of thermal cracking and gasket issues that are common with stock units on high-output engines. Diesel Power Source manifolds are a solid performance upgrade because they’re engineered to handle higher temperatures and increased flow without the weak points that cause stock units to fail. They bolt in where the factory manifold goes but give you stronger construction and better thermal characteristics. For anyone running higher boost levels, heavier duty cycles, or just wanting a more robust exhaust setup, our ISX and ISX15 manifolds are an effective way to get a noticeable improvement without major engine modification.
