[f5fstop]

Anytime, any company advertises a large increase in HP, I want written and verifiable proof.
I would bet that removing the fan on the H3 and replacing with an electric fan would not increase HP more than maybe 2-3 and that would be at low speed. The H3 fan is plastic, not metal and it is on a viscous clutch.
This is a declutching fan, at highway speeds the fan declutches and rotates freely since at speed about 30-40 mph, the fan cannot draw in any more air than what is already being pushed through the radiator due to the speed of the vehicle.
For driving around town, not sure you would notice anything. I do believe that as one person noted in regard to spark plugs, if GM could add a few HP and increase fuel mileage with the addition of this fan, they would have.