I just completed my installation of the updated Mantis Sport underdrive pulley. The engine feels a bit more free and when I say a bit, I really mean just a bit. Good value mod though. The hardest part was cutting the boss, everything else was really straight forward. I actually got the pulley for free, and got the belt for $52, so a nice inexpensive mod.
Thanks for all the technical data and installation steps, they made the job really easy for me.
