Bully Dog Big Rig Ceramic Coated FTP Exhaust Manifold 85403 (88310)

The Bully Dog Big Rig Ceramic Coated FTP Exhaust Manifold (Part #85403 / 88310) is a high-performance aftermarket upgrade designed specifically for medium-duty diesel engines.

Vehicle & Engine Compatibility

This manifold is a direct bolt-on replacement for the following engines and model years:

• Engines: * Cummins ISC 8.3L

  • Paccar PX8 8.3L

• Model Years: 2008–2010

• OEM Cross-Reference: Replaces stock manifold part numbers 4937714 and 4932348.

Key Performance Benefits

• Increased Airflow: Provides approximately 18–20% more airflow than the factory manifold.

• Improved Efficiency: Users typically see a fuel economy gain of 0.2 to 0.3 MPG.

• Lower Temperatures: Reduces Exhaust Gas Temperatures (EGTs) by 80–100°F and radiating surface temperatures by up to 300°F.

• Power Gains: Can provide an additional 28–32 horsepower to the rear wheels.

• Durability: The ceramic coating prevents cracking, leaking, and warping while improving turbo spool-up time.

Top Product Options

The Bully Dog 85403 Manifold is a premium ceramic-coated option that includes turbo studs. It is hand-ported and polished to ensure maximum flow and heat resistance for heavy-duty RVs and medium-duty trucks.

The Full Tilt 88310 Manifold is the same high-performance design (Full Tilt is the manufacturer for Bully Dog's manifolds). It features extra-thick flanges and a 3-year warranty, making it a reliable choice for long-haul durability.

Recommendation: If you own a 2008–2010 Cummins ISC or Paccar PX8 and are experiencing manifold cracking or looking for better fuel economy, the Bully Dog 85403 is the ideal choice due to its proven performance gains and superior ceramic finish.