try this, it work
i beleave your asking how to replace a different car if im correct, instead of the turismo, some other car? the way to do that is copy both files,WTD WFT, to the desktop,( or change them in the file), and right click / rename / replace name, this will change the name for both WTD, WFT files. the file dir will stay the same and you can replace any car! hope thats what your asking.