I want to fit a 450 cam onto my 2002 WR426 primarily for the auto decomp. Most of what I read, talks about using the YZ450 cam and not the WR450 cam? Is this primarily due to availability of the former? Can I assume either will work but with a different powerband? Can someone explain the differences between the two. I plan on leaving the intake cam WR stock. What are all the years that I can pull from if surfing the used parts (ebay) market? 03? 04?... I am trying to find one at a good price. Thanks for the help.