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how much difference does this actaully make?? like horsepower wise, and performance what does it do??
 

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between 4hp and 6hp, and it frees it (hp) across the whole powerband. Its a good mod and worth the money.
 

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Underdrive pulleys are a great Performance bolt-on.
They free up torque throughtout the power band and increase HP, reduce engine drag and engine revs smoother as well.

Typical HP Gains for hhe UR Unorthodox Racing Pulley kits are 5-10hp to the wheels.

I have them on 2 of my 3 cars and I love them..
 
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