AZ I have used hypertech on both my vette and my mustang GT. Excellent product, especially on the Mustang... you can adjust the cooling fans , trans mission shifts gear changes if you changed the rear end and it also has a preformance engine setup as well.

They run about 350 dollars.

Thery plug into the computer port on the OBDII cars, they dowload the stock settings and upload the performance settings. And yes you can return to your stock settings.

This is smething I was hoping could be done to the Crossfire, but I guess they haven't got there yet.

Email me if you have any more questions..

Mo