Our Knee Vents for the Ski-doo Gen 4 are designed to remove unwanted heat from the engine compartment. Our vents will improve belt life and help to keep under hood temps down while keeping snow and moisture out of the engine compartment. You have the option of running prefilter on our vents for colder climates that consistently have very fine snow. For maximum airflow we recommend running just the coarse mesh. Vent kits come with Black aluminum rivets, paper template and detailed instructions.