Been doing a fair amount of research into this. Both pulleys offer about the same increase in HP due to a decrease in rotating mass. The 3sx pulley is the same diameter as stock and therefore is better if you have a high power stereo system. The weight differences between 3sx and unorthadox is minimal. My main concern has been the long standing debate as to wether using either of these pulleys will affect your engine life. The stock one is a harmonic dampner and pulley in one peice. Neither the unorthadox nor the 3sx are harmonic dampners. I know that many people have used the unorthadox pulley without any engine problems. The 3sx pulley is newer (I think) and therefore there isnt as much feedback on it that I have seen. I have some good links to the debate on the pulleys but they are on a different computer. I will post them here later.
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