This manual covers Mercury MerCruiser V8 Marine Engines manufactured between 2001 and 2006, specifically the MPI generation. These engines, available in 5.0L, 5.7L, and 6.3L displacements, are engineered for marine applications, offering robust performance and reliability. Models include sterndrive variants such as MCM 5.0L MPI, MCM 350 MAG MPI, and MCM Horizon MX 6.2 MPI, as well as inboard configurations like MIE 350 MAG MPI and MIE MX 6.2 MPI. The manual details various transmission options including Sterndrive (Alpha, Bravo), Inboard, and Tow Sports, along with auxiliary Velvet Drive transmissions. The purpose of this comprehensive English-language document is to serve as a Repair Manual, Owner's Manual, and Parts Catalog. It provides essential information for repair, maintenance, and parts lookup. Key areas covered include general information, engine removal and installation, detailed engine specifications, transmission systems, drive chains, steering, and much more. The manual also offers in-depth guidance on routine maintenance for fuel, lubrication, cooling, intake, exhaust, and electrical systems, alongside advanced troubleshooting procedures. This resource is designed to assist owners, mechanics, and technicians in effectively maintaining and repairing their Mercury MerCruiser V8 marine engines.