Cummins ISX Intake Manifold CM871

The Cummins ISX Intake Manifold CM871 is engineered to increase clean airflow and improve overall engine efficiency by correcting the restrictive factory intake design. Designed for direct replacement, this high-flow manifold mounts using the factory position and hardware for a seamless installation without modifications.

By removing the factory “necked-down” section and implementing an open, optimized port layout, the CM871 Intake Manifold delivers up to 15% more clean air to the engine. This increase in airflow reduces intake temperatures, limits EGR flow, and provides gains of 15–20 horsepower, improving throttle response and fuel economy under heavy load.

Constructed for durability and precision, the Cummins ISX Intake Manifold CM871 combines strength, performance, and efficiency—helping your engine run cooler, cleaner, and more powerfully over the long haul.