I've got an FMF Titianium 4 on my YZ250F. I put an FMF USFS spark arrestor insert in it so I could ride in the woods/offroad. No where on the can does the pipe say "USFS approved Spark Arrestor." So I'm out riding and the local sheriff is poking around checking to make sure everyone's legal for stickers, spark arrestors, stolen bikes, etc. He looks at mine and says, "This thing isn't for offroad use....it's a race bilke pipe!" I said go ahead and stick your little do-dad up my "u-know" and see if there isn't a spark arrestor up there....heck, you can see it by just looking in the end of the pipe. He said, "yeah....but it doesn't say 'USFS' approved on the can." But he lets me slide because he says he's in a good mood. So what the heck's up with this? FMF sells this part as USFS approved...but then I almost get ticketed for it. I'm looking to put a YZF pipe on my wife's WR and now think I better by the PMB endo so she doesn't get nailed. What do you guys think? Is this legit?