I'm pretty sure it was WP I know it is PDS system-no link, it's on a 2008 300XC-W and it has been revalved by a local guy who also rides one. It was way smoother than mine as it was, you couldn't even feel the trail trash, it was like riding it on a carpet. The little rocks & sticks just didn't transmit thru to me. I'm shooting for that feeling in mine. I just keep clicking..... Do you remember your clicker settings? i may not be smart enough to get mine set, sometimes I'm not sure if it is to soft and blowing thru to bottom or it's to stiff and that is where my spikes are coming from... i've been going stiffer with damping and I think (???) it is better