By a Porsche 944!
Ive never been so comprehensively beaten in the whole time Ive had my 16v. I overtook at about 70mph on a motorway and then saw him accelerate to keep up. I dropped to 4th and I put up a good show until I changed into 5th at *15mph (bloody aerodynamics!). As soon as I slipped it into 5th, the Porsche just shot ahead to a frankly unimaginable speed. It was kind of like how a 16v would muller an RT at say 50mph!
I flashed him and then slowed down again and he waited up ahead to wave at me - when I saw that it had a roll cage in and was a "Cup" (?). Very gentlemanly!