Though some mules wear simple, stamped, metal VIN tags, this one has what appears to be a normal VIN plate with the usual etched characters and UPC bar coding, until you notice the suffix that reads EX—for experimental. Going further, while a regular ’05 Corvette coupe VIN would read 1G1YY24U855100001, this one reads 1G1YY24UX5X7120EX. Yep, more Xs to confound the DMV computer. The letter U in the eighth spot is shared with production Corvettes and signifies the new-for-’05 6.0L, 400hp LS2 mill. Historically, cars like this just don’t survive or ever wind up in private hands. But thanks to the open-mindedness of the GM Heritage Collection, this, and several other noteworthy engineering test cars, will live on. Wouldn’t you just love to show one of these things off to your friends? Just don’t try and get license plates—it ain’t gonna happen.