Recently someone mentioned that the new OEM water pump showed signs of increased flow rate.

Can anyone validate that?

Was there a revision to the original VM water pump?

Physically measuring the flow rate of an older OEM pump verses a new OEM would be a good way to find out. We need volunteers.

Keeping the head cool by increased coolant flow, may help prevent a HG failure.

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

Coolant flow is directly controlled by the thermostat so the only time a more powerful pump would be a benefit is when the system is stressed and the stat is fully open i.e. when towing or hill climbing.

If you really want to increase coolant flow I can sell you a broken OE stat

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