A buddy of mine that rides a raptor told me thats the new big thing on his website. A one way valve on his crankcase breather hose. A check valve which lets air out (pressure) and no dirty air back in. The guys that have them say they can tell a diff. - quicker throttle responce, smoother acceleration, etc... They even dynoed the product and it made right at 1.5 hp more. Has anybody else heard about this or is already running one??? Let me know... It is from a guy named Kenny on the raptor 700 forum that has his own shop.