Any good muffler shop can do the exhaust but you have to come up with the outlet.
I'm not sure if that is a one off custom outlet or off some form of super car.
Or the single version of something like this.
http://cgi.ebay.com/ebaymotors/Exhau...item3f05f8ff97
http://cgi.ebay.com/ebaymotors/2-5-T...item255f12d483
Put Exhaust tip in the Ebay search and spend a little time scrolling through the offerings and you will probably come up with an idea or two.
From having side pipes on the 48 for a number of years and having the exhaust dump in front of the wheels on the 71 I can truthfully say that they are one of the best ways to keep the rear wheels on your nasty that I know of. Lots of cleaning on a constant basis at least on both of my trucks when I ran side exhaust.