Here is an alternative to the K N filter for the M8
Twin Power Air Filter
• High quality long lasting replacement air filters• With a precision hand-poured design and urethane construction that will not crack or curl
• Our air filters will provide maximum air flow and peak filtration
• Made with four layers of high-flow surgical cotton gauze for superior filtration
• 100% washable and reusable
• It features durable, epoxy-coated, wire mesh design
• Made in the USA @ J P 41.99 plus tax