Re: The V6 only have a single exhaust
While the V6 only has a single exhaust, the underside is exactly the same as for the Hemi application that runs to two exhaust tips. If you look under the WK2, you can see there is plenty of room to add a second exhaust pipe...easy for a good custom exhaust shop to do it. Of course you'd have to cut or replace that lower part of your rear bumper with the one for the Hemi.
The only problem is that by simply adding a second pipe aft of the muffler split-off you'd affect the overall exhaust pressure which could adversely affect the engine's performance. The 3.6 V6 engine and accompanying computer have been designed assuming that single exhaust at the rear to provide desired backpressure for proper engine operation; it's an exhaust system. If one is still intent on that dual-tip look, a good fabricator can place restrictors in normal diameter (2" or 2.5"?) stock pipes so you get the Hemi dual-exhaust "look" but keep the stock backpressure for the intended single pipe of the V6.
It's part art, part science, but there is definitely room to run dual exhaust pipes off the muffler underneath the WK2. In fact, there is so much room under there I would surmise they have that spot in mind for a battery pack for a future hybrid. Take a look underneath behind the rear bumper and you'll see what I mean about how huge an area it is. I'll post a pic when I get a chance. That extra space COULD have been used to push the spare a bit deeper down to increase the cargo area, but they chose not to because....?