As someone who rode with these dampers on a sled, I can attest to the difference, it was night and day. Granted it was on a Vector a couple of years ago. The Yammi scientist was at Pats Yamaha in da UP, they had 2 identical sleds , 1 with, 1 without. Sent us out on test rides in pairs, then swapped sleds and came back, then asked if we could tell a difference in 1. As far as dropping the coin on a older sled to do it.... I dont know. But getting them for free on a 16, its a no brainer.