'02 polaris pro x 440 fan has 71 hp out of the box. That is 71hp engine output. The '02 zr440 snopro has 99 hp engine output. Engine output is not the same as actually output to the track. Usually an engine will loose 10% of hp from the engine to the track. But also remember a zr440 is a liquid and prox fan is obviously fan cooled. Its big difference
While I do own a Pro-X fan the Cat would walk all over it.
The prox might keep up off the line to around 30mph the cat would walk right away. How come compared the Cat to a Polaris fan?? Why not the liquid Pro-X?? I know , 'cause the POLARIS would WIN
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