If you see a VIN like this, you're a factory insider. Again, photographed at the Florida Barrett-Jackson auction, the EX suffix on this VIN identifies it as a preproduction prototype. This particular tag (VIN 1G1YY24UX5X7120EX) belongs to an '05 C6 Corvette test mule. Stuff like this rarely gets into private hands. When it does, registration for road use is virtually impossible since the VIN is not valid. The lady at the DMV will give you a strange look and then call her supervisor. Both will deny papers. By contrast, the only oddity about most pilot car VINs is the low number. They're typically OK for legal use and registration.