Pump sizing query

[Sumo1]

Thanks, Mark. That's a great answer. In fact, I read some literature about the MaxFlo that showed me the low flow rate you mentioned. Now I'm back to leaning toward the Whisperflo 2hp 2sp (#011524). I called a Pentair dealer and he said that on low speed at 60 ft of head, it would flow between 50 and 60 gpm, and about 120gpm on high. However, isn't the high speed flow rate irrelevent since my 2inch pipe only flows 73gpm max?Thanks....Hal
PS: This pump is an uprated 2hp.