I have a predator programmer for 2004 GM's that i ended up getting for free. I used my benchtop harness and found that it was vinlocked. I have heard 2 different stories. 1: that diablo sport will unlock it for like $100-$150 and 2: that they wont unlock it unless you have the receipt and you are the original owner. It sucks cause it's just sitting in my room doing nothing. It's funny though that as is it's almost a worthless piece of plastic, but with the tune in it, it's worth $250, and it's a shame just to throw it away, so any suggestions would be great.