As long as u dont have a supercharger the underdrive pully will help. Idk about the power gains but i can belive it. It will not mess up a tune. The reason is because the underdrive pully slows down the speed at wich the accessorys are spinning. Less speed less power to drive them. In other words all its doin is taking down the rotating mass a little bit. You should see some quicker throttle response also.
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