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Uni Filter Replacement Air Filter for 1977-82 Suzuki GS550E/M Katana/L Impulse - NU-2439 2011 Honda TRX420FPA IRS --Outer 2011 Honda TRX500FE FourTrax ForemanUni Filter Replacement Air Filter Uni Filter Street Bike Air Filters are a direct factory replacement filter and are designed to fit perfectly into your stock airbox They provide unsurpassed airflow, dirt stopping ability and overall performance Manufactured from patented open cell polyurethane filter foam Designed for full depth filtration and increased air flow over stock Made in the USA Here is how a Uni Foam Air Filter works: "Open Cell"