This complete genuine MerCruiser engine is rated at 315hp at 5200 RPM. This NEW engine will replace all models of MerCruiser tow sport inline engines built between 1990-2010 and will work in pre-1990 applications with some modifications. This engine is raw water cooled, with genuine MerCruiser dry-joint exhaust manifolds and risers and MPI (multi-port injection). This engine and 100% of the components are brand new and not remanufactured.