white brothers carbon pro question..

hello well a friend of a friend is selling a carbon pro for a 2004 yz450 which was his old bike... well he never had a spark arrestor or jetted his bike for the pipe so i am curious

-can you get a spark arrestor for this pipe?

-what size jet woulud you run? 2 sizes larger? this is in michigan... sea level and cool weather generally i know there are many factors but this is a pretty much stock bike

thanks and hopefully someone can help

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