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Absolute loudest without tuning/codes (Aka leaving factory primary cats ALONE) is going to be something that attaches to the primaries and just dumps the exhaust under the car or straight out the back.
But if you're looking for a setup that you can actually buy and install straight out of the box, I doubt you'll get any louder than my setup without touching primary cats/headers (which = tuning). I'm sure you've seen my thread but it's basically the Borla 60606 X pipe and Corsa Xtreme axle back, they fit perfectly together and ditch the secondary cats/factory X/crushed rear pipes and the Xtreme axle back is brutally loud on WOT/downshifts but cruises very tamely and is manageable for going out to dinner under 3000 RPM just like a stock car.
I bet there are other systems that are louder down low or are cheaper but doubt you'll find one that's louder, doesn't drone, and is well made.
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