1. i ONLY use BMC OR OEM....
I toss all K & Ns in the trash or use them for door stops :)
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BMC's high flow filters provide maximum protection, performance and quality. These washable air filters are manufactured to higher tolerance than competing brands for maximum filtration area and flow rate. BMC incorporates parallel pleated cotton fabric and special filter oil to offer flow rates of up to 900 CFM.
Features and Benefits: