Installation Instructions

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PDI (Performance Diesel Inc.) Big Boss Intake Manifolds are built in the U.S.A. to increase and balance the air going into your truck's engine. By opening up the manifold in key areas, airflow will increase by up to 35%. This leads to lower air intake temperatures resulting in power and torque gains as well as fuel economy improvements. These direct replacement manifolds are simple and quick to install and utilize factory hardware and existing engine components. 

Key Features & Benefits

  • Available for Cummins ISX and X15
  • Mounts in Factory Position
  • Improves Airflow to the Engine
  • Cooler Intake Air Temperatures
  • Adds Additional Horsepower
  • Includes New Gaskets
  • Many Drivers Report Fuel Mileage Improvements
  • 1 Year Unlimited Mileage Manufacturer Warranty



PDI uses only the best material for their intake manifolds. Like all PDI products, this manifold is designed to make more horsepower and create more efficiency so you save money while making the drive more enjoyable.


This product can expose you to chemicals which are known to the State of California to cause cancer. For more information go to
California Proposition 65 Notice
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