Bully Dog Caterpillar® Stage 1.5 Big Rig Turbo Part# 56800

The Bully Dog 56800 (also known as the Stage 1.5 or Stage 2 Big Rig Turbo) is a high-performance replacement turbocharger designed for a specific range of Caterpillar heavy-duty diesel engines.

Vehicle & Engine Compatibility

This part is compatible with Class 8 and 9 semi-trucks (such as Kenworth, Peterbilt, and Freightliner) powered by the following Caterpillar engines produced between 1984 and 2003:

• 3406B / 3406C: 14.6L models (1984–2003)

• 3406E: 14.6L and 15.8L models (1994–2003)

• C15: 14.6L models (1999–2003); also fits 2004 Single Turbo Non-ACERT models

• C16: 15.8L models (1999–2003)

Key Performance Specifications

The Bully Dog Stage 1.5 Big Rig Turbo is engineered to support applications ranging from 400 to 750 Horsepower.

• Design: Non-wastegated single turbo with a 78mm billet aluminum compressor wheel.

• Performance Gains: Typically provides 6–10 lbs of additional boost over OEM and a 60–70 HP increase.

• Efficiency: Users often report a fuel economy increase of 0.3 to 0.4 MPG due to improved airflow and reduced exhaust gas temperatures (EGTs).

• Durability: Features a reinforced exhaust housing and high-quality copper journal bearings and thrust washers. It is triple-balanced up to 180,000 RPM for high-speed reliability.

Installation Note

This part is a bolt-on replacement and generally does not require a core charge. However, it is not available for sale or use in California on pollution-controlled vehicles.