I've put this tip on, and removed the stock exhaust tip. The spark arresting screen is still in the exhaust and can be seen with a flashlight when shined up the pipe. The USFS in Washington can be a pain. Can anyone tell me where or what marking on the stock exhaust indicate it's USFS approved? I may be suffering from man's disease (can't find it because it's right in front of me). I can just see it now...after they inspect the DOT stamp in the sidewalls, they'll give me a hard time because THEY don't know what any of the markings mean, either.