Replace the old, cracked, or damaged exhaust manifold on your 2020-2023 Chevy/GMC 6.6L L5P Duramax and get your engine running right. Due to heat cycles and age, exhaust manifolds can be prone to cracking and cause boost or exhaust leaks. This can rob you of power and reduce engine efficiency. Most exhaust manifolds available are cast in high-silicon ductile iron for increased durability. You'll find top-notch brands such as AFE, BD-Power, ATS, Dorman, and more.