I have actually had really good luck with cheap eBay mufflers. I really don't mean to snub people running akro and yosh and stuff but when it comes to a muffler...it's a tube with some holes in it. I can see shelling out some more money for titanium or carbon fiber but at the end of the day if you're running a stainless or aluminum can then paying a bunch of money for the right name on the side is exactly that. I have different thoughts when it comes to headers, but a muffler is a tube with some holes in it.
I'm also running cheap eBay pipes on my CX500 and I think they sound rather nice, as well:
My issue there is my seat isn't flat...it ticks up toward the hump. Makes it hard to match long straight mufflers to it. The cones expanded and filled the gap. I'll figure something out with it...though, as said, it doesn't bother me now near as much as it did when I started. I think the old pipes looked better but I don't think these look bad.
The bike is easily dismissed because it's not powerful. I think the chain drive 750's will become more popular. Motors are easy to work on and reliable, the frame is easy to make your own, they're cheap....all the great hallmarks of a fun builder that you actually intend to ride. I have more than one friend with nice "classic" and typical cafe builds but they don't ride them because finding parts is hard. Right now there isn't another Shadow like mine and I'm not afraid to ride it. It's not a rocket but it's fast enough, handles nice, cruises at 75~80 without any problems...it's fun to ride. I don't claim to be a trendsetter or anything but it's going to click with people before too long that it's a fun, viable chassis.