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Discussion Starter #1
I just bought a new Supra and I was told that I have some type of Unorthodox Racing Underdrive Pulley. Can anyone please explain what this is and what it does. Does it increase horsepower or just reliability? Any help would be appreciated.

-Ryan

**Also is this a good brand?
 
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I've always heard that underdrive pulleys remove the harmonic balancer and cause #6 to go. Is there any truth to this?
 
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