Replace the old, cracked, or damaged exhaust manifold on your 2004.5-2007 Dodge 5.9L Diesel and get your engine running right. Durable, high-silicon ductile iron manifolds are offered as an upgrade or stock replacement for many applications. A failed exhaust manifold often cracks, or leaks, from heat cycles, age, and other conditions. This can result in boost leaks, or exhaust leaks that can reduce engine efficiency and rob you of power. You'll find top-notch brands such as AFE, BD-Power, ATS, Dorman, and more.