03 YZ450f Spark Arrestor

I have an 03 YZ450 with a full titanium Akrapovic exhaust. I wanted to take this out to some public lands in Utah, but need to have a spark arrestor. I can't find anything that bolts on. Is there a way to fabricate something that does this, so I don't get in trouble with the law.

Have a friend in a similar situation, what was your solution?

Do you still have your factory silencer??? If you do you can buy a pro-moto billet end cap for it that is usfs approved.

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