Chances are, if you haven't replaced your serpentine belt lately, it needs replacing. Regardless of mileage, age is unkind to rubber belts. Gates is a well known brand in many automotive circles, and an OEM company for many automotive brands today.

Gates now also offers a "Gates Racing" version, designated by the "RPM" for "racing performance muscle." These are extra nylon reinforced, low stretch, made very specifically to OEM specifications. They're specifically designed for lower heat, slip, vibration, and noise.