Steve,
Have a look at the third message down on this page:
http://pantera.infopop.cc/eve/...562/m/4850059725/p/7
It's by Kelly Coffield and he has some interesting thoughts on mufflers for 180's. If Kelly say's the ones he decided to use are good, I'd suggest they're probably excellent, knowing Kelly. The fact that they're easily re-packable is a huge added benefit.
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