I have an '04 Cobra motor with a Kenne Bell blower. Everything else is working fine, but I've been blowing idler pulleys (not the same one every time). They actually crack, start to split open, and then shred the belt off. I've never seen this before on other cars or applications. Anyone else? Causes? Aftermarket idler pulley solutions?? I'd like to run ones similar to the idler from KB that sits next to the blower pulley, but anything that someone has found that works would be great... if anyone else in the world has had this problem.