Pre-Filter Air Intakes: Located behind the windshield on the dash, the pre-filter design includes a large surface area to minimize snow ingestion and maximize airflow to the engine. Lightweight Rails: Lightweight rail beams shed pounds yet deliver incredible strength. Perc Reverse: Perc (Polaris Electric Reverse Control) offers the convenience of push-button reverse. It's the ultimate creature comfort. New P2 Clutch: The latest in legendary Polaris clutching, the new P2 (Polaris Performance) secondary delivers lightweight performance, improved backshift and increased overwind for improved top speed. Liberty 600 CFI Engine: Featured in all 600 models for 2010, this engine is a leader in its class, with improved run quality, cleaner emissions and outstanding fuel economy.