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Biggest change in sound will come from the axleback portion, hence "stealth" exhaust setups that keep the stock axleback portion but change everything else. Your best bet is to just pickup a quiet exhaust; again nothing will change tone and sound to the degree that an axleback can.
If you're looking for the typical WRX/STI boxer sound, that requires changing exhaust manifolds...which there aren't even that many of if you want that sound (Borla comes to mind).
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