Soo…I recently replaced my alternator with a reconditioned one …and since then I noticed the pulley on it had a small notch in the V’s where the belt sits in that looked defective to me …and coincidentally, I have not been able to stop my belt from squeaking, no matter how I have adjusted the tension. This precision product by Perrin has a much higher quality build quality and offers lighter weight for better throttle response. The belt just fits in way better and has eliminated my issues. Out of excitement I got a second one for my other Subie. High performance meets dress up. Win win.