The screen inside my old q silencer is falling apart.  Where can I send it to get replaced?

And what are the options for an add on spark arrestor?

Mat will repair it with a new spark arrestor and add a turn down if you want for $120 or you can buy a new silencer with arrestor and turn down for $120. I've already enquired with Mat about this. If you have yours repaired you have to send your silencer to him. I get ahold of him on Facebook he responds quick and is an awesome guy to talk to.