The extra flow may or may not be helpful... if there's already optimal cylinder filling/emptying given the factory valve timing, extra exhaust flow might rob you some of some low end grunt.
It may or may not be worthwhile only with a different intake set-up (and probably need a retune too).
With that in mind...
Do the x-pipes provide two separate paths or do they join in the middle and then split again?
Any dynos that show comparison between the X and Y pipes?
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