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Well, looks like he definately did upgrades from looking at the exhaust. The DIC is a one line display, so it's pre-2005. So I wonder if he took a 2005+ HUD and plugged it in. But if he did that, where does the accelerometer data come from?
I had to look twice to find the images you were talking about. The link is to an ebay car ad, but if you click on the 'larger picture' link you can scroll through a series of images until you see the HUD display. That HUD display shows a g-meter on the bottom right side of the display and this is on a 2004 Z06. That's why it doesn't seem right...
Where is the accelerometer data coming from to get displayed? If the data comes from one of the computers, then odds are very high that the displayed picture isn't from that car. But if the accelerometer data is generated in the HUD, then maybe he swapped the C5 HUD for a C6 HUD.