lot of the rally cars use 2 x 044s but its as much about reliability as outright power requirements, you can run a 330hp WRC on one 044 if one fails but it stops dead if you only have one fitted lol.
Guess they must use non return valves too or in the event of a pump failure the other pump wouldnt pump properly?
flow and pressure rates all seem a bit subjective to me, so i think youre right, if peeps think 1 pump might be marginal, they go for two
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