"High volume pumps are for increased demands on the oil system such as higher RPM usage, racing, remote filters and or coolers, etc." where extra oil is needed.

this is what i belive would be the only reason you would need a hv pump. if it moves the oil so fast at 50 mph@50 lbs. of pressure that it cant cool the oil i dont know. it is JMO that if you have a tight motor with the proper clearence then a hv pump wont make no dif.