PDI Big Boss Intake Manifold for Cummins ISX / X15 CM2350 (2013.5–2024)

Part Numbers: 5440760, 3688355
Fits: Cummins ISX15 & X15 CM2350 Engines (2013.5–2024)
Warranty: 1-Year Unlimited Mileage Warranty

Boost Airflow, Lower Intake Temps & Gain Horsepower

Whether you’re running a performance build or trying to optimize your daily workhorse, the PDI Big Boss Intake Manifold for Cummins ISX and X15 CM2350 engines is a must-have upgrade. Engineered to increase and balance air intake flow across all cylinders, this manifold delivers up to 35% more airflow than the factory design.

Increased airflow leads to cooler intake temperatures, more efficient combustion, and an estimated power gain of up to 20 horsepower. This direct bolt-on manifold is precision-engineered to fit into the OEM location and uses your factory mounting hardware—no modification required.

Key Performance Benefits

• Up to 35% increase in airflow to the engine
• Lower intake air temperatures for improved combustion
• Gain up to 20 HP from optimized air delivery
• Direct bolt-on replacement using factory hardware
• Precision-engineered for Cummins CM2350 platforms
• Made in the USA with performance and reliability in mind

Emissions Compliance Notice

NOT LEGAL FOR SALE OR USE IN CALIFORNIA or other states adhering to CARB emissions standards.

OEM Cross Reference

This intake manifold replaces Cummins OEM part numbers: 5440760, 3688355

Simple, Straightforward Installation

The Big Boss manifold mounts in the factory position using OEM hardware. No tuning or fabrication is required—just bolt on and enjoy more power, better throttle response, and enhanced drivability.

Frequently Asked Questions (FAQs)

What performance gains can I expect?

You can expect up to 35% more airflow and 15–20 HP gain along with lower intake temps and improved combustion efficiency.

Is this a direct-fit replacement?

Yes. The manifold fits into the factory position on Cummins ISX15 and X15 CM2350 engines and utilizes existing hardware—no custom work needed.

Will this manifold fit my 2017 Cummins X15?

Yes, as long as your engine is a CM2350 platform from 2013.5 to 2024, this manifold is compatible.

Is this legal in California?

No. This product is not legal for sale or use in California or other CARB-regulated states.

Where is this product made?

This intake manifold is proudly Made in the USA using precision manufacturing and quality-tested materials.