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You know Ive learned about this after I did the mod. Theory wise Im not so convinced since its less restrictive with true duals, but Im not a expert ill see how the new mods work with the exhaust.

I can't see how the x-pipe would cause any restriction. That said, what I would do with an existing system like yours is to add an H-pipe. Less noise and less restriction than the duals. The best place to add the crossover can be found by spraying a little regular paint (not high temp) on the pipe past the collector. Where the paint stops burning off is supposed to be the ideal spot for the crossover.