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Any DIN sized head unit will fit, and you can do double DIN for nav if you are willing to either re-locate the climate controsl or remove your cupholders.
That said, I would stay far away from anyplace like Circuit City or Best Buy. Personally, I wont shop at those places at all for anything more than a random cable or a CD. When it comes to doing custom car audio, you dont want the $8/hr part time employee workingon your Porsche. Find a reputable local shop who is known for high end work on higher end cars and work with them.
Keep in mind also, that while you may pay a few dollars more for a certain component locally (and even this rarely applies now, the market is far too competitive) you will actually get service, and even more importantly, service AFTER the sale from the reputable shop, where when you walk into Circuit City 6 months later to ask why your stereo doesnt work, you're likely to hear something along the lines of " Oh, 6 months ago? Yea, that must have been Jeff or Bob that did your install....neither of them work here anymore so I'm not sure what to tell ya. You're under factory warranty so why dont you call Sony directly." To me, service after a sale is worth its weight in gold.
Patrick
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