Old pump was/is making a ton of noise, so its getting changed out. Never really had problems with low mph cooling, off-road, even when its been 90s or 100s degrees outside. This new pump is supposed to provide twice the flow at idle, higher flow in the lower RPM range, less hp to turn etc etc. Probably overkill for this 4 cyl though -- but what the hey, it was only $100 for the Flow Kool vs $50 for the standard pump, so no biggie.