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Ditto.... Underdrives are a 90% race feature....

Now I under drive My Alt on the Nova.. but I also have one of the new CS alts... that are made to run at a lower RPM and produce a higher amp and volt than the SI series alt for a given RPM...
 

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I used to have one and couldn't keep the engine cool. I've never seen one yet that worked. I guess if your cooling system was so overly-efficient that it didn't need normal coolant flow to keep the engine cool it would work but I haven't seen too many high-performance engines like that. I would avoid underdriving the water pump. More ponies to lose than gain.
 
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