You should be fine using the pickup off the rudder. Problem is that making the hole bigger means more speed will be needed to move more water through the larger hole-and the water system. So if you are not WOT all the time, the water cooling effect may not be as great; a rule of water flow/physics.
When you run, does the water outlet spray out like a fountain or is it a drip kinda? What are the motor temps?
When you run, does the water outlet spray out like a fountain or is it a drip kinda? What are the motor temps?
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