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The University of Idaho's (UI's) entry into the 2009 SAE Clean Snowmobile Challenge (CSC) was a semi-direct-injection (SDI) two-stroke powered REV-XP snowmobile modified to use flex-fuel. The flex-fuel engine produces stock engine power on any blend of ethanol and gasoline from E10 to E85. The emissions output was reduced using an oxidation catalyst located after the exhaust silencer. Noise from the engine compartment was reduced by custom-carbon fiber hood and side panels, which allowed placement of extra sound absorbing materials. The UICSC design produces 80.5 kW, is lightweight at 238 kg wet, and achieves a fuel economy of 5.65 km/L on E85 fuel. The UI snowmobile achieved Third Place in the competition, while producing the best fuel economy and winning several other awards, including Best Acceleration, Best Value, Best Ride (fueled class) and Best Subjective Handling.

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.