As SafetyMom said, it's in the same building as Test Track. It will be on your left as you are heading towards the area with all of the cars. There always seems to be a long wait for it--at least a half an hour. When I was there last week, there was only a 10 minute wait, so I decided to give it a try. As SafetyMom says, it's pretty much just a five minute commercial for GM. You put your face into a virtual reality mask, and your seat moves back and forth and vibrates a bit. It's nothing spectacular. I wouldn't go on it again unless I could walk right on.
Karen