I just installed the A.C.T. kit I purchased at Royal Dist. It was easy, ran about $90.00 U.S. It looks to be the same as the A.D.Boivin set-up. If we could get some snow I would let you know how it works. I am not sure what the Cat kit contains, but if you look at the new sleds, they just have a stop block bolted to the rail. It isn't really coupled, it's just a travel limiter. $129.00 seems kind of high for that, don't you think? I rode a 2002 ZL600 SS EFI with the factory "coupler" and it rode extremely smooth, so if I get even half the ride that the new sleds get, I will be happy. Going to Munising this weekend for 7 days-we'll see.