Replace the old cracked manifold in your 2003-2007 Dodge 5.9L Cummins with the AFE 46-40011 BladeRunner Stainless Steel Exhaust Manifold. A cracked exhaust manifold can rob you of power and hurt engine efficiency. Built from cast 304 stainless steel, the AFE Stainless Steel Exhaust Manifold features a reinforcing rib for strength along the flange and ultra-thick wall flange at the port. The BladeRunner exhaust manifold outflowed the factory exhaust by 23% improving exhaust flow, performance and throttle response. This manifold also features 2 EGT probe ports, thick wall design for increased strength (0.25" vs 0.15" for the stock unit), matched ports and has a merged runner design to maximize exhaust flow. Once you install this awesome exhaust manifold, you will feel improved turbo spool up times, improved throttle response and performance. Features: CARB EO# D-550-9 Cast 304 Stainless Steel Drop-In Replacement For Stock Manifold Pre-Drilled & Tapped For (2) EGT Probes Thick Walled Design For Maximum Durability Note: Gaskets and replacement manifold bolts are not included. CA Residents: CARB E.O. Number on file - LEGAL for use in California.