Just replace your mufflers if you are only going for sound and will not buy the ebay one for whatever reason, and I see no reason not to, other than it does not have a heat shield which you could make up yourself with some sheet metal.
I love the sound of an intake, I had a K&N FIPK on my old 4.0 I6 Jeep and it made that thing sound mean as hell. But on the Audi I skipped the intake because I knew that it would do nothing power wise, I instead decided to replace just the mufflers on my car with Magnaflow's. Full exhaust on the 3.0 might be good for 5-8 HP, so again I did not see it being worth the $800-1200 price tag of lets say a Milltek catback, so I just replaced the mufflers, which gave me the sound I wanted as well as better looks. It only cost me $340 installed for the two mufflers, less than the cost of a "name brand" intake for the 3.0 and my 3.0 sounds mean as hell now when I get on the pedal, but still quiet and classy when crusing normally.
I may get a K&N drop in filter and hack some holes into the airbox, but other than that my intake is staying stock. And below is a sound clip of my exhaust if you are wondering.
http://www.youtube.com/watch?v=Tl2XcKKxRXs
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