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I heard the electric water pumps were a waste. You can get a package deal from www.brenspeed.com on the water pump and under drive pullys. I don't know the price off hand but I don't think it's more than 600 dollars. To add to the subject I actually enjoy the gains from the under drive pullys.
As far as I know it's better to have the electric water pump for an SC which is in the planning/saving stages now. UDP's are a waste in that case since they just come off for the sc install. Brenspeeds package costs about 550 I believe you get the water pump and the crank pulley but again why if I'm just going to take it off.