If not a sigma what would you use?

From what I have seen, an 8000 pump on a Super Farm pulling tractor requires more h.p. to turn that bigger pump, than the h.p. gains from it. I would stick with a good 7000 pump.
 
NorthEastDiesel gets my vote, making some pumps that have engine dyno proven HP. Pretty sure one big shop will be using them in some of their builds!
 
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