Performance wise, Fast Intentions. It's an X pipe design as opposed to a Y pipe, allowing for increased flow. NA there won't be a major difference, but boosted, there will be. With F.I. headers, there is no comparison to performance.
Sound wise is subjective.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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