Dual is gonna be techincally for better flow. The Y-Pipe will more then likely be a bottle neck for back pressure once to a certain point. Most of us won't get there where it will effect us enough to notice but think of it this way. You have 2 seperate pipes, both 2.5" all the way through. Then you have a y-pipe that is 2 2.5" into a SINGLE 2.5" (so basically you went from 5" of flow to 2.5" of flow). One of the benefits of the Y-pipe i would think is a little more low end power due to more back pressure.
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