Going back to the link:
http://www.fastestlaps.com/laptimes/4d90aa2aa585d.html
I just found out that the lap times for the Ford GT on Streets of Willow was on the opposite direction. That answers my question on the Ford GT's time. However, how is the FRS still faster than the Ford Mustang v6? I'm guessing the FRS is a more balanced car perhaps?
This is where we all can see that being a good driver can be one of the best mods you can do.