k n high flow direct fit air filter red 50-state legal provides 1 to 4 h.p. power gain 96 to 99 percent filtration efficiency 7.25 in. height 0.625 in. flange length 3.375 in. flange i.d. 5.813 in. flange o.d. oiled element round straight style made of multiple interwoven layers of surgical cotton gauze increases horsepower and acceleration while providing excellent filtration custom designed to fit into existing air box and features a drop-in design which means adding performance is simple provides high air flow with excellent filtration economical and environment friendly works with oem vehicle electronics will last the life of your vehicle washable and reusable lasts up to 50 000-mile before cleaning is required depending on drive condition with k n s limited million mile warranty auto parts warehouse has extensive k n air filter catalogs.we are now offering free shipping on all k n air filter orders over $50.00. our secure k n air filter catalog is available every hour of everyday. shop with confidence for all your k n air filter needs. k n air filter are in stock and available today. save upto 60% off dealer price on your next k n air filter purchase. our online catalog contains a wide selection of the oem and aftermarket parts you need at unbeatable prices