K&N Replacement Air Filter YAMAHA YZF R6 99-05; YZF R6S 06-09 High Performance Air Filter for the Yamaha YZF R6 and R6S 1999-2005 YAMAHA YZF R6 599 - All 2006-2009 YAMAHA YZF R6S 599 - All Highest Performance Best Flowing Filter for the Potent R6!!