Bully Dog Caterpillar® Stage 2.5 Big Rig Turbo Part #56858

The Bully Dog Big Rig Stage 2.5 Turbo Part #56858 is a performance turbocharger specifically designed for a wide range of Caterpillar engines manufactured between 1984 and 2004. It is a popular upgrade for high-horsepower applications, typically those operating in the 700 to 1,000 HP range.

Engine Compatibility

This turbo is a direct bolt-on replacement for the following Caterpillar engine models:

• 3406B: 14.6L (1984–2003)

• 3406C: 14.6L (1984–2003)

• 3406E: 14.6L and 15.8L (1994–2003)

• C15: 14.6L (1999–2003) and 2004 Single Turbo (Non-Acert)

• C16: 15.8L (1999–2003)

Vehicle Compatibility

While primarily defined by the engine model, this part is commonly used in Class 8 & 9 semi-trucks including:

• Kenworth

• Peterbilt

• Freightliner

• Western Star

Key Specifications

• Compressor Wheel: 80mm Billet Aluminum for faster spooling and increased strength.

• Exhaust Housing: 1.58 A/R ratio, designed to optimize airflow for high-power demands.

• Mounting: Standard T6 flange exhaust manifold compatibility.

• Performance Gains: Can add 30–40 horsepower and improve fuel economy by 0.3 to 0.4 MPG.

• Installation: Bolts up to factory locations and typically includes oil line and manifold gaskets.