before you spend money on another idler pulley give rob a call. he made me a c3 pulley saver kit and it is a great addition to the c3 pulley. the kit eliminates the idler next to the c3 and adds more belt wrap in addition it adds 100mm pulleys were the 90mm idlers were before. with the machined bushings the added bracing this kit is a no brainer. you wont regret it