There is a FAQ at the top if this particular forum listing hat gives a lot of info with links and such. Also, if you are in the New England area, there are a series of shops called Lou's Custom that specialize in exhaust systems. You pick your muffler brand and the tips for your muffler. They even do dual if your car can support it (which I think the 2012's can ) The whole process takes around 2 hours or so and around $500 or so. If you don't live in the Northeast, then I suggest looking around. You may find an alternative.
Also, there is an exhaust topic listing on the main page...