Need a recommendation for a muffler for a YS 140S

[bravo52]

I need to purchase a silencer for my YS 140 Sport to go in a Fantasy.  Notice I didn't say tuned pipe because all of the info I've read says one is not needed for entry level.  I was told by a fellow discussion list member that someone has gone as far as using a Mac's silencer for an OS 46!  Any opinions on the different setups would be appreciated. 
Thanks, 
 Jerry L.
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