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The University of Idaho's entry into the 2006 SAE Clean Snowmobile Challenge (CSC) was a second-generation gasoline direct-injection (GDI) two-stroke powered snowmobile. A modulated and battery-less direct-injection system was used to decrease exhaust emissions and improve fuel economy without reducing the power output of the engine. The team added a reduction catalyst designed for a two-stroke to the exhaust silencer to further reduce exhaust emissions and noise. Under-hood noise was targeted by using sound absorbing materials and a sealed hood. Chassis noise was addressed by using a spray-on rubberized material that absorbs vibrations transferred through the chassis. The snowmobile entered into the 2006 SAE CSC competition was lightweight, easy-to-ride, powerful, fuel efficient, and had reduced exhaust emissions.

The University of Idaho's (UI's) entry into the 2007 SAE Clean Snowmobile Challenge (CSC) was a third-generation gasoline direct-injection (GDI) two-stroke powered snowmobile. The modulated and battery-less direct-injection system fully met the competition goals of “improved emissions and noise while maintaining or improving the performance characteristics of the original snowmobile.” The students designed and manufactured a new head for a stock two-stroke 600cc snowmobile engine. The head was designed to use direct fuel injection to control fuel quantity and timing to reduce fuel short-circuiting. Performance was refined through the use of precise engine mapping. The emissions output was further reduced by a reduction catalyst located in the exhaust silencer. Noise from the engine compartment was reduced by using sound absorbing materials and a sealed hood. The UICSC team consisted of students from freshmen through graduate students.

The University of Idaho's entry into the 2001 SAE Clean Snowmobile Challenge provided proof-of-concept for a clean and quiet snowmobile using a four-stroke engine, exhaust after-treatment, and electronic fuel injection. This combination provided excellent emissions and fuel consumption performance while maintaining acceptable power. In 2002, the UI improved on this design by fine-tuning the engine, using higher efficiency components to improve power transmission, and adding sound damping to reduce noise. For 2003, the University of Idaho continued to improve on this design with a larger displacement engine, a tuned exhaust, and a new strategy on noise emissions. Results included achieving First Place overall in the competition, and five other awards. The team also began developing a direct injection two-stroke engine for competition in future years.