If you want an inexpensive alternative, have you tried Delkevic? They have a number of Slip-on systems for the CB1100 all for under $300! And all their systems contain the link pipe and centre stand stop which would be the hard part if you were to try adapting a universal muffler to your bike, not to mention the hanger bracket itself.
http://www.ebay.com/itm/Oval-Muffler-Exh...1795724714
Interesting. I will call tmro and see if they will sell me a link pipe. They have others listed on eBay, so they shouldn't have an issue. Their pipe has the center stand stop on it. I like the look of the helix muffler, because it has more of a classic look. Thanks for the idea. I'll post pics if this project comes to fruition.