Boyesen Super Color Water Pump Cover and Impeller Kit:
Cast aluminum construction
Increased coolant flow in all RPM ranges
Patented nautilus style impeller for hydrodynamic efficiency
I have one full XC season with this cooler and have seen some significate improvements. I run a KFX450 and have always had a problem with overheating. It still gets warm but not to the point where it starts dumping coolant. In the middle of a 2 hour race that means the difference between finishing and getting towed in.