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Uni Filter Replacement Air Filter for 1996-02 Buell S1/X1 Lightning - NU-3428 2011 Harley-Davidson Sportster Custom - XL 1200C 2007 Kawasaki ZX1400 Ninja ZX14Uni 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"