It looks like the top-shelf, one-off 550-hp engine upgrade for that new Iacocca Mustang is worth about $362,000, at least to one buyer. The fifth of just 45 2009 1/2 Iacocca 45th Anniversary Edition Ford Mustangs to be made crossed the block on Saturday at the Barrett-Jackson auction in Las Vegas with a winning bid of $320,000. After fees, the car's final selling price was a whopping $352,000. That's well above the $89,950 MSRP of the other 44 limited-edition, coachbuilt specials. We just wrote about the Iacocca 'Stang and said that the car's exclusive dealer, Galpin Motors of California, would offer engine upgrades for an undisclosed premium. We seriously doubt that the actual surcharge will come anywhere close to the premium secured on the Barrett-Jackson car.

So what made this particular Iacocca attractive enough to bring such a lofty price? Well, for one, it had that upgraded, supercharged 550-horsepower engine. Another reason this one sold for a price nearly four times higher than the base model was that it was sold at auction, with the bidders getting whipped into a typical Barrett-Jackson feeding frenzy. Finally, it was in Las Vegas, a city where fiscal responsibility takes a backseat to, well, pretty much everything. While we love the custom composite coachwork on this special fastback Mustang, and acknowledge that this one is unique with its supercharged engine, that price just seems completely insane. The Iacocca topped many impressive other rides that were up for grabs; follow the jump to read more results. Apparently, everything that happens in Vegas doesn't always stay in Vegas.