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You will gain none or barely any performance swapping catbacks on an NA setup. All your realized performance pretty much ends not much further from where all your exhaust streams are collected coming out of the engine. That's why people tend to focus on headers, overpipes, and front pipes.
I prefer to think of catback only from a sound enjoyment point of view. From that standpoint, running complete systems is probably better for sound and build quality. Mixing and matching from a sound perspective is a gamble.
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