Adds extra protection to your engine in harsh riding conditions. Filter blocks particles larger than 0.007" (0.19 mm). Easy, tool-less installation. Necessary to maintain vehicle warranty when tracks are installed. Required to install the Apache and Backcountry Track Systems. Standard on Outlander 650 X mr, 850, 1000, 1000R engines & G2L PRO. Not compatible with Snorkel kits G2, G2L, G2S, Defender (except X mr models), Defender MAX