K&N’s sportbike racing air filters are designed to maximize air flow, with fewer pleats and just two layers of cotton filtering material. The filters are washable and re-usable and come with a one-year limited warranty. The company cautions that because these filters flow more air, they will require modifications to a stock bike’s fuel management system (re-jetting or re-mapping the ECU). Suggested retail for the Yamaha YZF-R6 race filter (pictured) starts at $87.96, from dealers. For more information, contact K&N Engineering, Inc., Dept. RW, 1455 Citrus St., Riverside, CA 92507, (951) 826-4000, www.knfilters.com.