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USD 1600
Part #: BT85101

Bully Dog 85101 Ceramic Coated Exhaust Manifold

1999-2003 Cummins 14.9L ISX Signature 600
Part #: BT85101
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The Bully Dog 85101 Ceramic Coated Exhaust Manifold provides an upgrade to the old stock manifold on your 1999-2003 Cummins ISX. The Bully Dog Heavy Duty Exhaust Manifold features a high-flowing design that provides quicker turbo spool, higher power output and more fuel economy for class 8 engines. Bully Dogs engineering team has spent considerable time analyzing and flow testing various layouts for each manifold utilizing state of the art CAD design software. 

Each manifold is simulated and prototyped numerous times as they search for the design that produces the ultimate efficiency. There are two primary goals they are striving for in the design: first, to maximize the airflow by smoothing out the sharp corners of the stock manifolds and eliminating any bottlenecks in the design and second, to eliminate any known failure points in the stock manifold. The final result is an impressive piece that not only looks great but is fine-tuned in every aspect to improve the performance of the engine.
Increased Airflow The sharp corners common on the stock manifolds have been eliminated along with other improvements to increase airflow. More airflow equals greater turbo response and an increase in horsepower to the rear wheels. Independent testing on a flow bench shows 18% greater airflow over the stock manifolds.

Better Design The tolerance of these three-piece systems has been tightened to prevent leakage at the joints. A special metal alloy has also been used that is superior to the stock manifolds, so that all three pieces expand and contract at the same rate as the engine heats up and cools down over the life of the manifold.

Reinforced Design Bully Dog didnt skimp on the material in the design. These premium manifolds are thicker all the way through to prevent cracking. The thicker manifolds combined with the reduction in heat from the ceramic coating has also proven to help lengthen the life of the gaskets. The end result is a better quality casting.

Ported and Polished Each manifold is ported and polished once it is received from the foundry. This is done to ensure that no metal burrs interfere with the airflow that robs both horsepower and economy.

Ceramic Coated The manifolds havent just been ceramic coated to make them look better. The ceramic coating both inside and out ensures that heat generated by the engine is more fully utilized to spin the turbo. The less the metal absorbs the heat, the greater the turbo response and the more efficient the engine. These ceramic coated exhaust systems not only reduce the radiating temperatures coming off of the manifold by 300, they also reduce exhaust gas temperatures (EGTs) by 80 to 100.

This exhaust manifold replaces Cummins OEM Part# 3880199. Fits non-EGR applications. 

  • Reduced EGTs
  • Up to 30HP Increase
  • Ceramic Coated Finish 
  • Improved Engine Efficiency
  • 18% More Airflow Over Stock 
  • Reduced Radiating Temperatures
  • Ported Design Eliminates Flow Interference


  • MFG. Number 85101
  • Manufacturer Name Bully Dog Heavy Duty
  • Shipping Weight 65.00 lb.
  • Shipping Length 11 in.
  • Shipping Width 11 in.
  • Shipping Height 35 in.
  • Fuel Type Diesel
  • UPC 681018851015
  • Prop 65 WARNING: Cancer & Reproductive Harm -


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Emissions Notice

This product is not legal for sale or street use in California. Certain aftermarket products are subject to governmental emission standards regulated by the California Air Resources Board. In order for these products to be legal on a specific vehicle in California, the part number must receive a CARB Executive Order (EO) number. This number makes the part legal for use only on specific years, makes and models of vehicles. A decal with CARB EO number for these parts must be displayed in the engine bay to satisfy smog inspection requirements.