I have read over a couple of the forums on here that include some clutch modifications done on the Kodiak's. At the moment my quad contains a sheave milled by Coop, a Purple Secondary Spring and 18 Gram roller weights both by EPI. The results are nice, the RPM's at cruising speeds are a little much but something I can get used to. Besides the point, I was viewing JBS's Performance packages which looked to include a new sheave, OD Weights and spring of your choice. I am wanting to know if you guys happen to know the true differences, advantages or disadvantages to OD Weights vs. Roller weights from EPI, Coops sheave vs JBS Sheave. Is there any performance differences, top speed differences or so on. Right now my quad under full throttle on a stretch with 190 pounds on it will hit 58 MPH. I have seem some higher and some lower results from other riders on the Internet. Basically just looking for an overall input from other people with more experience. Thanks in advance!