Talk:List of all cars (fully upgraded)/@comment-5.158.241.224-20140801222716/@comment-89.104.10.164-20140802065010

You can't buy it right now, even if it is theoretically unlocked. You have to play the chellanges to get it. Not sure when they will be available though. I'm certain you're able to buy it afterwards, even when you haven't completed all chellanges.