K&N Replacement Air Filter - Round Tapered - Universal 5.75in Base OD x 5.938in Top OD x 7.688in HThe K&N E 9289 Air Filter is designed to increase horsepower and protect your engine by reducing restriction and providing excellent filtration. The E 9289 custom air filter is manufactured to replace the air filter in the 57S 4000 performance air box and it comes with a K&N embossed lid cap. The filter media can be washed and reused repeatedly. The E 9289 custom air filter is manufactured to replace the air filter in the 57S 4000 performance air box.