I was following an 05 GTO (duel hood scoop) in my stock STI...he was infront of my on an open highway by 5 car lengths. We went from 80 to around 140 and I stayed with him all the way...he may have pulled an extremely small amout. Maybe half a car length. I really didn't think my car could stay with him at those speeds. We did this 2 times with the same result. When I drove around him at lower speeds he gave me a thumbs up. Really cool guy. Then he followed me for a mile and the road opened up again...I punched it and got a head start on him. He stayed the same distance behind me and didn't pull any. I went to around 120 and let off. he went by me and waved again. He also had 2 people in the car with him. I was really excited that I stayed with him since they have like a 107 trap speed in the 1/4.
Also, about 5 months ago I test drove an 05 GTO. Seemed pretty fast but I only took it up to about 80 and the STI felt quite a bit faster....thats why I chose the STI over the GTO.