Bully Dog Big Rig 85401 Ceramic Coated Exhaust Manifold for 2013-2019 Paccar MX-13 12.9L in Kenworth & Peterbilt

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Part #: 85401 UPC: 811252020230
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Installation Instructions

Bully Dog Big Rig Exhaust Manifolds 85401 Details

Bully Dog Big Rig premium ceramic-coated exhaust manifolds are the fastest flowing exhaust manifolds in the industry. Designed for superior heat control and exhaust flow, they help your turbo spool more quickly.  Whether you are looking to replace a faulty or leaky exhaust manifold on your rig, or just want to experience the difference a performance exhaust manifold can make in your daily driving, you can expect higher power output, lower temps and improved fuel economy with a Bully Dog Big Rig exhaust manifold. 

Key Features

  • Note: Replaces Stock Manifold Part Numbers 9886 & 9887
  • Usually Found In Kenworth & Peterbilt Trucks with Paccar MX13 Engines
  • 50 State Legal. CARB E.O. #D-828-3
  • 18% More Airflow Over Stock
  • Hand Ported and Polished
  • Ceramic Coated Finish              
  • EGT Temperatures 80-100° Cooler
  • 0.2 to 0.3 MPG Improvement
  • Radiating Temperatures 300° Cooler
  • Improved Fuel Economy Over Stock
  • An Additional 30 HP to the Rear Wheels
  • Two Year Unlimited Mileage Warranty
  • Includes turbo studs

Bully Dog Big Rig Exhaust Manifold Overview


Bully Dog Big Rig Exaust Manifolds are engineered to maximize exhaust flow, which results in approximately an 18% improvement in flow versus your stock manifold. Exhaust Gas Temperatures are reduced by around 100 degrees Farenheit and fuel mileage gains of around 0.3 MPG are common. Designed and built in the U.S.A., you know you're getting a quality product built the right way with premium materials and the quality control you'd expect in an American manufacturing company.



This product can expose you to chemicals which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.
California Proposition 65 Notice
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