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Old 10-03-2012, 06:04 AM   #53
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Join Date: Aug 2011
Location: Augusta, ME
Posts: 357
My Ride: 06 STi
Originally Posted by nawewawe View Post
What is everyones opinion about a Under Drive Pulley kit? The sellers say it can free up horsepower up to 10hp? Is this true?
In short, yes it will free up some power, BUT given all the **** that runs on electricity in your car, are you willing to under-drive your alternator? Also there's a few studies out there about how lightweight / underdrive crank pulleys can cause premature engine wear because they primarily get rid of the harmonic dampener.
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