A couple people have used the Borla 40477 because it's design is more convenient for routing the dual piping compared to a design like the 40348.
With the 40348, you would have to route two pipes from the right side with the right tip being an easy gradual 90 degree bend, but the one for the left side being, well, kind of a mess. Especially for a space that really isn't that big.
The closest example would be the new Ford Racing ST exhaust, but they use a single exit and create a dual tip for the middle-exit. It's not a dual exit exhaust like you are wanting, but the bends you would have to do for the driver's side exit would be similar (except longer). I don't think it would look very nice or be worth it to save some money.
I know it's over a hundred bucks more, but I'd do the 40477 and make it easier on whoever is bending you some piping.
Also, dyn085 raised a good question concerning gains.