I would guess it was a newer M3 or a pretty modded E36. I raced an M3 in my old civic and had him till 60 and my car was lightly modded with a GSR swap. If I had FI I would have raped most "fast" stock cars on the road.
I raced a Supercharged GSR about 2 weeks ago. They are quick little cars. I would get him off the line and hold the lead for a long while, somewhere around 100 - 110 mph he would slowly start to creep past me. Fast little cars