Cummins ISX Signature 600 Stainless Steel Casting Exhaust Manifold 3880199

Engineered for Cummins ISX Non-EGR engines (1999-2003), this OEM-equivalent exhaust manifold (3880199) delivers measurable performance gains. Cast from virgin stainless steel with precision tolerances, it improves fuel efficiency by 0.2-0.3 MPG while adding 28-32 HP. The advanced design—featuring reversed male end pieces, a female center section, and thicker flanges—optimizes exhaust flow and reduces manifold temperatures by approximately 300°F. Superior material composition and press-fit construction ensure greater durability and elasticity compared to factory originals, making this a reliable upgrade for serious engine performance.