Not sure how long this will be up, but here goes anyway.
This is a video of the 2007 Mustang Cobra test mule. Two guys are driving along and see this thing getting on the highway and they pull up next to it. The car looks much like a GT, but it has the special wheels and hood. Very cool video!
EDIT: this url has changed as the previous one has gone down. http://home.ptd.net/~quic5pt0/cobratestmule1.wmv