Bully Dog 2003.5-2007 Cummins ISX Big Rig Ceramic Coated FTP Exhaust Manifold 85102 (88201)

The Bully Dog Big Rig Ceramic Coated FTP Exhaust Manifold (85102 / 88201) is specifically designed for heavy-duty trucks equipped with the Cummins ISX EGR engine. This manifold is a high-performance replacement for the factory unit, engineered to improve airflow and durability.

Vehicle Compatibility

This manifold is compatible with the following engine and vehicle configurations:

• Engine: 2003.5–2007 Cummins ISX 14.9L with EGR (Exhaust Gas Recirculation).

• Common Applications: * Kenworth T800 and W900 (2004–2010 models with the specified engine).

  • Peterbilt models equipped with the 2004–2007 ISX EGR engine.

• OEM Cross-Reference: Replaces OEM part number 3682959.

Key Features & Benefits

• Performance Gains: Designed to provide an additional 28–32 horsepower and an improvement of 0.2–0.3 MPG in fuel economy.

• Heat Management: The ceramic coating helps reduce exhaust gas temperatures (EGTs) by 80–100°F and keeps surface temperatures up to 300°F cooler than stock.

• Durability: Features thicker manifold flanges and walls to prevent the common issues of warping, cracking, or leaking found in OEM manifolds.

• Improved Response: Hand-ported and polished for 18% more airflow over stock, which leads to significantly reduced turbo lag.