A brand new 600-class engine that promises to give Polaris racers a big boost of horsepower is the key to a new 2021 Polaris 600R race snowmobile unveiled September 10.

The featured sled – designed specifically for snocross racing applications – is combined in theory with the mountain-focused 2021 850 RMK Khaos and cross-country-aimed 600 Indy XCR to create a three-pronged effort to win on race tracks and courses across North America and beyond.

However, the 600R is different – the other two sleds are available to any consumer but are adapted by race teams for competition; the 600R is only available to race teams and has some very specific features.
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https://snowgoer.com/news/polaris-gives-snocrossers-more-power-in-2021-600r/28851/