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Me personally I'd prefer keeping the dual exhaust it just makes the car look more balanced. Like others have said, it's your car do what you think looks best for you.
I have to admit I like the balanced look of the dual set up. Luckily I have a few "have to" items on the on the agenda before I can get to the "want to" items
the X is better suited to the dual look because of the cars size. I chose single for weight and flow(I know this has been argued before). I feel like the duals sounds better for some reason, though.