Indystreetracer has them on his bike. Look under the mean streak accesories section and search for the post, "Fairing mod." He has a few pics of his bike w/ nomad bags and a harley batwing posted there.
When I first bought my bike I thought about doing this. Since the Nomad and Classic use the same engine, the exhaust from them could be used. The difference would be mounting points. If you can modify/weld mounting points to equate those two bikes, I can't see why it would be much more difficult.
The one on my bike is the Vance & Hines Baggers. Cobra also makes the same type of exhaust system. You can also buy a stock exhaust system from the Nomad and bolt it on first to see if you like it. It does require Nomad bag brackets to mount the exhaust to. I do have a stock Nomad exhaust I would sell for $100.00 plus actual shipping charges.