The common misconception about valve cover breathers, is the filter media used in your most common breathers is for filtering air into the engine. This is false. The motor experiences constant blow by, therefore, constant pressure is being emitted from the crank case. 

As your "filter" clogs up with oil & dirt during racing conditions, the rate at which the engine can relieve the constant pressure slows down. Increased crank case pressure puts pressure behind the pistons, causing you to lose power the more the filter media gets clogged. 

Our Breathers are TRUE breathers. They have no filter media and are free flowing. No more clogging, no more crankcase pressure, and no more power loss throughout the race. The pathways inside the breather also allow for you to wash your racecar without ever having to take them off. THATS RIGHT, no more duct tape covering your valve covers. 

Will these breathers gain you power? No, but will they let you keep your power throughout the race? Absolutely!