Electric water pumps

I tried to get one from Jeg's and they were on back order for every so I got mine from Mancini Racing. I asked them about the 35gph and the 55gph. Thats when they told me about the flow rate for the strip and street. Something about it(55gph) would move the water to fast to cool it for track use. I am sure it is a little more complicated than that but you get the idea.