K&N Performance Gold Oil Filters for the Scion FR-S/Subaru BRZ have been constructed from the ground up to satisfy the high performance needs of race car owners and drivers, as well as the average vehicle owner who wants the very best oil filter available. K&N's oil filter efficiency rating meets or exceeds the requirements of high performance automotive engine builders. The heavy duty construction helps reduce the risk of rock and stone damage. The real quality isn't just on the outside, the inner filter element traps contaminants as small as 10 to 20 microns in size. K&N uses metal top end caps instead of paper to ensure that no unfiltered oil can get back into the system. The solid construction allows for oil flow rates between 12-16 gallons per minute (depending on filter size), and is unaffected by racing fuels. All K&N Performance Gold Oil Filters are manufactured to exacting engineering standards.They are covered by a limited warranty to be free from defects in materials and workmanship when installed and replaced using engine and equipment manufacturers recommended service intervals.