The Arctic Cat T660 Turbo ST is a snowmobile model from the T660 series, primarily produced in the early to mid-2000s. This model is distinguished by its turbocharged, 4-stroke, inline 3-cylinder engine, typically around 660cc, delivering enhanced performance for touring and sport touring applications. It features a Continuously Variable Transmission (CVT) system and a chaincase driven drivetrain, designed for reliability and comfort. The T660 Turbo ST is recognized for its robust engineering and touring capabilities, often incorporating a two-up seating configuration. This comprehensive parts manual catalog provides detailed information for the Arctic Cat T660 Turbo ST snowmobile. It covers all major systems, including the engine and powertrain, chassis and suspension, bodywork, electrical components, and controls. The manual is designed to assist owners, technicians, and parts departments in accurately identifying and ordering every component through the use of highly detailed exploded diagrams and manufacturer part numbers. Its purpose is to facilitate efficient parts identification, assembly, and disassembly, ensuring the continued maintenance and repair of the vehicle.