The arguement of a car stock compared to another car stock allows for equal drivers. I mean would you argue that stock Focus would beat a stock McLaren F1? No because given comparitive drivers one would be obviously faster than the other. The Focus could beat a McLaren if the other driver had never driven a car before and had to hop in and figure it out but it proves nothing to which car in it's stock form is faster. It just proves who is the better driver. That being said if the 05 GT puts out comparable power and is lighter it doesn't take a rocket scienctist to figure out which is faster.