The quality of the Unorthodox is better then the ASP pulley. With the ASP, you'll need file the key way to make it properly fit. The Unorthodox fits perfect, no filing needed. If you had both pulleys in your hand, you can definitely feel the weight difference between the two(unorthodox of course being the lightest). If the pulley is installed correctly, there won't be no squeaking. I had the ASP in my car, and I switched to the Unorthodox once I saw the quality of the pulley compared to the ASP.