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Open Stock & Open Improved
Open Stock

All snowmobiles must follow ISR rules and weights in stock form.

2 Stroke -  Any stock qualified snowmobile as outlined in ISR rules with the exception of allowing an aftermarket muffler

4 Stroke - Any stock production 4stroke, no modifications to engine,turbo. Oem waste gate and blowoff valve.

Modifications allowed include
- ecu flash or boondocker 
- charge tubes may be change but must remain oem diameter
Open Improved


2 Stroke - Improved Stock qualified sleds allowed to a maximum of 800 cc's 

4 Stroke - Any production 4stroke, no modifications to engine,turbo. Waste gate and blowoff valve changes/replacement allowed.

Modifications allowed include
- ecu flash or boondocker
- down pipe and straight pipe (header must remain oem)
- charge tubes may be change but must remain oem diameter
- aftermarket air intake (must be under hood and can not alter oem appearance)