The 2009 Ski-Doo MXZ 50th Anniversary 600 HO E-TEC is a special edition snowmobile featuring Ski-Doo's advanced 600 HO E-TEC two-stroke engine known for its strong performance and efficiency. This model was built to commemorate Ski-Doo's 50th anniversary and likely includes unique styling or graphics, though the core features are defined by the engine and the MXZ platform. The E-TEC engine provides prompt acceleration and is designed to be more fuel and oil-efficient than previous models.