02 Boxxer had Hydrocoil1 damping and the rebound adjuster Knob did bugger all. On 03 models the damping adjustment actually works.
they pretty much the same, teams and world cups this year both kinda sux but a little tinkering with the glide rings and rebound catridge(thanks to the rock shox factory mechanics) and you can have one sweeeeeet fork alot better than z1