I haven't removed the Crossfires, but I've gotten numerous radios out of other cars without having the keys. I usually just unscrew the entire bracket thats holding in the stereo, sometimes you need to take apart a little more of the dash than you expected in order to get at all the screws.. Then slide that entire bracket out (its probably also holding the heat/AC controls and the buttons below the stereo) and its easier to get the radio out. Once you get the entire bracket out, you can see the tab to push with a screwdriver (exactly what the key does) to release the stereo, or you can get at a screw that will release it, etc etc. Each car is different but try and get the whole bracket peice out. Like I said, I don't know if this works on the Crossfire, but I've done a ton of installs and rarely have had the correct key.