K&N Replacement Air Filters. K&N air filters are ideal for extended use in dirty and dusty off-road riding and provide clean carburetion even at high altitude. As a rule, no jet changes are required with just a K&N filter element, however the spark plug condition should be checked for proper mixture after the first few miles of riding. If the airbox has been modified for increased air flow, the main jet size will need to be increased to provide the proper fuel mixture.Additonal Fitment:2000-2011 SUZUKI DRZ400S2005-2009 SUZUKI DRZ400SM2000-2008 SUZUKI DRZ400 E2000-2003 SUZUKI DRZ400