the circulation pump doesn't affect the risers in any way.... closed system with antifreeze
you won't gain any horsepower though... you may even lose some... the pump still takes energy to drive tho now it will go through the alternator and be converted to to electricity (with losses) and then be converted back to motion by the electric motor (more losses) Also the pump will be running full speed at all times so even if you are idling you will be using the same hp on the pump that you would use at wot.
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