Cosworth has done a lot of tuning, but “the” Cosworth is the Ford Escort RS Cosworth.
http://uk.cars.yahoo.com/car-reviews/car-and-driving/ford-escort-rs-cosworth-2003497.html
The car we’re talking about is the F6 Typhoon:
It’s in Gran Turismo 4.
There’s 2 now, 3 if you count the Focus RS. 