iv"e been using the u-pro spool in 21.5 boosted class now since they came out & had now issues or wear with it at all,(when it needs replacing it will be with the sidepiece one)not sure i would use the upro one in 13.5 or lower though
mike, had 2 meetings now with the 1 screw in the layshft & am really impressed with the difference in the car(great tip)
btw do you ship your products to australia ???