What you have is a NON CROSSFIRE computer installed I had some warrenty work done on the computer of my 04 limited and I took it out and when I hit 110 it was as if someone put the brakes on it wouldn't go any faster. I took it back to find out while other madels of computers will work they also have speed governors in them they changed it out at no additional cost and back to 145mph I was.
Mike