OK I know that american turbine & dominator impeller's both work in the dominator pump but my ques. is on the chart's I have a A.T. impeller (A) with 500hp will turn 5400 rpm and the dominator (A)will turn 5150 rpm does one throw more water then the other! out of the two would one give me a little more? which one is beter? or is it they will run the same at the rpm given??? just want to put the best one in! can anyone shed some light on this subject please thank's Ty