Boyesen WPK-45O Orange Supercooler Water Pump Cover and Impeller Kit Fits: KTM 450 EXC 12-15, 450 SX-F 13-15, 450 XC-F/W 12-15, 500 EXC 12-15, 500 XC-W 12-15; Husqvarna FE501 13-14, FC450 14-15, FE450 14-15; Husaberg FE450 13-14, FE501 13-14 Unlike the stocker, Boyesen's 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 Unlike the stocker, Boyesen's 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 Patented nautilus style impeller for hydrodynamic efficiency, reducing heat, gaining horsepower and extending engine life Can reduce engine temperatures by as much as ten degrees