The Polaris Ultraweb high performance air filter was co-developed by Polaris and Donaldson to create the highest performing air filter for this vehicle. It uses Donaldson exclusive Ultra-Web® Nanofiber Filtration Technology which offers a higher initial efficiency compared to standard cellulose media and has very high efficiency throughout a filter’s life. Provides superior engine protection with 99.99% efficiency. Superior dust-holding capacity and 20% increase in service life over the stock air filter. Lower restriction over gives you better performance for high horsepower, torque, and acceleration. Designed To Fit: 2020-2021 RZR S4 1000 2020, 2015-2016 RZR 900 2020 RZR Trail S 900 Premium 2020 RZR Trail S 900 2020 RZR Trail S 1000 2020 RZR Trail 900 Premium 2020 RZR 900 FOX Edition 2019 RZR® S 4 1000 2019 RZR® S 1000 2018 RZR® S4 900 EPS 2017-2019 RZR® S 900 EPS 2017-2019 RZR® S 900 2017-2019 RZR® 900 EPS 2017-2019 RZR® 900 2017-2018 RZR® S 1000 EPS 2017 RZR® 900 EPS XC Edition 2017 RZR® 4 900 EPS 2016 RZR S 1000 EPS 2016 RZR 900 EPS FOX Edition 2016 RZR 900 EPS XC Edition 2015-2016 RZR S 900 EPS 2015-2016 RZR S 900 2015-2016 RZR 4 900 EPS 2015 RZR 900 XC EDITION 2014-2016 RZR 900 EPS Ease Of Installation Easy Subbed From 2881063 WARNING Cancer and Reproductive Harm - www.P65Warnings.ca.gov.