You don't have to have it say on the exhaust that it's USFS approved. G&F and at AMRA events (as you know I work tech every year in San Manuel) all that is done to check for a spark arrestor is the poking of a wire in the exhaust.
You can use one of the universal screen type inserts but be prepared to clean it with a propane torch after every one to two rides as they like to plug up. However, it would make you legal. If you are creative you could even make or adapt a turbine core insert to the factory silencer and it would also be legal.
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