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There are such that keep using stock catback with aftermarket exhaust. But as headers & frontpipe also may affect sound, no sense in asking for sound clips, as different models of them may sound different. At very least UEL vs EL. But different models of type too, and so do different frontpipes. You may try finding something if you search for threads for specific header, though i'd probably be too lazy.
From issues that may stem up though and worth looking into, if your new header is catless, cat readiness check CEL may pop up. Worth getting ecu tune with those checks disabled (and also to extract more power from aftermarket header better scavenging/less resistance to flow).
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