My first visual impression of the exhaust tips was 'very cool'. My first thought was, "dual tips make it look very balanced - I hope that both are functional!"
I was pleased when I looked down and saw that both tips are indeed 'functional' with the single muffler splitting the exhaust out both sides.
I have seen several cars with cosmetic tips like this with the exhaust only on one side. I think that it looks silly on a cool/cold day to have the exhaust steam only exiting one side.