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It all depends on the horse power of your car.

I agree. A 15 second car will gain a lot more ET than a 9 second car. Since you already are running an underdrive (smaller) crank pulley, unless you turn high rpm (>7000) I don't expect much gain.

But the electric water pump is really nice for cooling off the motor after a run. Shut the engine off, run the water pump and electric fan for a few minutes and it cools a bunch.