Wait a second! According to some self-proclaimed Duratec tuning guru on the NECO forums, who is actiually an ignorant choad, you can't change the rev limiter as it is "hard-wired" into the car.
Yeah right!

I LOVE stirring the pot!

All joking/sh!t stirring aside. You can change the rev limiter and speed limiter, so good luck with getting Fordchips to help you out on that.