Just an idea, and probably wrong, but maybe they are already testing the new engine on it and that's where they are having an issue. Instead of trying to deal with it later, they are getting it finished before they even put out any of them.

Another theory, maybe they know that people are going to bump up the HP and TQ on these cars, like Saleen, so they are making sure that people don't suddenly have complaints about this problem. It would, in all reality, be the person's responsibility because it would void the warranty at that point obviously. Now if they are setting up some deal with Saleen, like Ford with the Mustang where it doesn't void the warranty, then maybe they are making sure that they don't get these cars back where they have to fix all of them and have upset customer's that paid some good money for them.

As I said, probably not even close with either of these theories.