after reading more on true duals, I think this merging to one is similar to the H pipe in the 2011 to equalize the pressure and then my guess is, like most have said, they split back up in the muffler. so if one were to take the muffler apart you would see the single pipe go back into a Y and then go their separate ways. is the 2012 any quieter than the 2011? something like this quick sketch...and according to what I've read this is not a "True Dual" setup.