Heat Is the #1 Enemy of 4-Stroke Engine Performance Boyesen SuperCooler Water Pump Cover and Impeller Kits are specifically designed to enhance the performance of your engines cooling system. These high-flow, hydrodynamic water pump kits have been tested and designed to flow more coolant. By increasing the flow, the engine will run cooler at a more constant temperature. The Boyesen Supercooler can reduce engine temperatures by as much as ten degrees, as confirmed by tests at Team Kawasaki. How does the Supercooler achieve this? Hydrodynamics. Boyesens investment-cast aluminum water pump cover has bigger water inlets, a sculpted design, no casting seams, less restrictive corners, a more efficient impeller and less cavitation. Win the War on Heat, Bolt on a SuperCooler NOW! 2-piece cast aluminum construction. Oil filter access for hassle-free filter changes. Increased coolant flow at all RPM ranges. Patented Nautilus style impeller for hydrodynamic efficiency. Note: Gasket(s) is NOT included; use stock piece(s) or purchase new one separately. Feature details: Casting: By casting a totally new water pump cover, Boyesen was able to maximize the flow through the unit. Boyesens design takes advantage of everything from Bernoullis Effect to biological studies. Superior Internal Hydrodynamic Shaping: Stock water pumps arent very hydrodynamic. Their internal shape and impeller create excessive amounts of air bubbles in the water. Air bubbles lessen not only water flow, but the amount of water per cubic gallon. Boyesens Nautilus-shaped cover and impeller increase pump capacity. Optimized Water Inlet Diameter (High Cooling Capactiy): Unlike the stocker, Boyesens water inlet has an increasing diameter and artfully curved shape. This is a vast improvement over most stock inlets, which decrease in diameter as they near the impeller and have a 90-degree bend at the pump (a very serious hydrodynamic no-no). Optimized Impeller (Patented Nautilus-Style Impeller): Boyesens patented impeller design is 25 percent more efficient at moving water than the inefficient stocker.