Review on Gates 36173 DriveAlign Belt Drive Tensioner Pulley by Marco Gavi

I needed to change the belt and decided to replace the pulleys while I was at it. Note to those doing it themselves, I thought I could just do it from the top, but it's MUCH easier to access them from the bottom. My engine made normal running noises at idle, no whistling or anything like that, although it really isn't. I think they'll do something, just wanted to replace them while I got my hands dirty, but after replacing them my engine was noticeably quieter at idle so I guess I still had to replace my pulleys, the old ones kept spinning still normal and there was no backlash but a new set helped. They're cheap enough that anyone changing a strap could do it.