Hi All, I have been looking for a pipe for my 07 WR450. I know some pipes will fit the YZ450 and the WR450. Does the 06 YZ450 and the 07 WR450 use the same pipe? Also, is it the full system that is the same or just the silencer, etc.? Thanks, Nate EDIT: The pipe I am looking at is a FMF Factory 4.1 slip on and mid pipe.