This High Flow T3 Exhaust Manifold outflows the factory exhaust manifold by up to 25%, delivering measurable performance gains for 2003–2007 Dodge Ram 2500/3500 trucks with the 5.9L Cummins common rail diesel. The thick wall (0.25″ vs. 0.15″) T3 flange design increases strength, eliminating warping and cracking common to factory manifolds. Designed as a direct replacement, this T3 exhaust manifold combines port-matched runner geometry with durable ductile iron construction to reduce exhaust backpressure and support turbo response in towing and performance applications.

Fitment

• 2003 Dodge Ram 2500 — 5.9L Cummins Diesel Common Rail (T3 turbo flange)
• 2004 Dodge Ram 2500 — 5.9L Cummins Diesel Common Rail (T3 turbo flange)
• 2005 Dodge Ram 2500 — 5.9L Cummins Diesel Common Rail (T3 turbo flange)
• 2006 Dodge Ram 2500 — 5.9L Cummins Diesel Common Rail (T3 turbo flange)
• 2007 Dodge Ram 2500 — 5.9L Cummins Diesel Common Rail (T3 turbo flange)
• 2003 Dodge Ram 3500 — 5.9L Cummins Diesel Common Rail (T3 turbo flange)
• 2004 Dodge Ram 3500 — 5.9L Cummins Diesel Common Rail (T3 turbo flange)
• 2005 Dodge Ram 3500 — 5.9L Cummins Diesel Common Rail (T3 turbo flange)
• 2006 Dodge Ram 3500 — 5.9L Cummins Diesel Common Rail (T3 turbo flange)
• 2007 Dodge Ram 3500 — 5.9L Cummins Diesel Common Rail (T3 turbo flange)

Product Details

• Material: Cast ductile iron with reinforcing rib for maximum strength and heat resistance
• T3 Flange Thickness: 0.25″ (versus 0.15″ factory stock) for superior durability and crack resistance
• Flow Performance: Outflows factory exhaust manifold by 23%, improving performance and throttle response
• Port Design: Matched ports and merged runner geometry reduce exhaust backpressure and maximize exhaust flow
• Auxiliary Ports: Two pre-tapped Exhaust Gas Temperature (EGT) probe ports for easy installation of gauges or pyrometer equipment
• Turbo Compatibility: Direct fit for factory Holset turbo systems; compatible with towing, hauling, and daily driving
• Application: Designed to replace factory manifolds that warp and crack under repeated thermal cycling

Installation

This is a direct bolt-on replacement that connects to factory engine mounting points. Use fresh exhaust manifold gaskets and high-quality mounting studs and nuts with every installation. Torque fasteners in a staged pattern on a cold engine to prevent warping or gasket failure.

Check local emissions regulations before purchase. Professional installation is recommended.

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