Electric power steering:
http://www.demon-tweeks.co.uk/Motorspor ... ering/2023Davies Craig for waterpumps:
http://www.daviescraig.com.au/ No idea what sort of power increase you would see but the engine would feel a bit more lively. You would not see the same power increase as you would spending that money on the engine. It's actually not quite right to say 'power increase'...the power was always there but running an electric pump just means the power is not being used to turn pulleys and belts.
I had a car running a Davies Craig water pump. It had good and bad points. I could cool the engine after a run by having a switch to turn on the pump and radiator fans. Draining and refilling the system was easy, just turn the pump on and let it pump coolant around the system.
The downside...it comes with a connector on it. This once vibrated loose enough for the pump to turn off which I did not know about until the temp gauge flopped to cold and then off the top at the hot end. I hard wired it in after that and did not have a problem. If I was to get another one I would set up a warning system that would alert me if the pump is turned off or there is low coolant flow.