Bully Dog 2008-11 Cummins ISX Big Rig Ceramic Coated FTP Exhaust Manifold 85103 (88203)

The Bully Dog Big Rig Ceramic Coated FTP Exhaust Manifold (Part #85103 / 88203) is specifically designed for heavy-duty trucks equipped with the Cummins ISX engine featuring a Diesel Particulate Filter (DPF).

Vehicle & Engine Compatibility

This manifold is a direct bolt-on OEM replacement designed for the following specifications:

• Engine: Cummins ISX with DPF (Diesel Particulate Filter).

• Model Years: Typically fits vehicles manufactured between 2008 and 2011.

• OEM Replacement: Replaces stock manifold center part number 3683789.

• Common Applications: Widely used in Class 8 semi-trucks from manufacturers like Freightliner, Kenworth, Peterbilt, International, and Volvo that utilize the 2008–2011 Cummins ISX engine platform.

Key Performance Benefits

This manifold is part of the "Full Tilt Performance" (FTP) line, engineered to address common failures in factory manifolds while improving efficiency.

• Improved Airflow: Provides approximately 18% more airflow over the stock manifold, which leads to a 28–32 HP increase.

• Better Fuel Economy: Real-world testing typically shows a 0.2 to 0.3 MPG improvement.

• Heat Management: The ceramic coating reduces Exhaust Gas Temperatures (EGTs) by 80–100°F and radiating surface temperatures by up to 300°F.

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