I've seen a few at the track.
The wife owned a 98 Cavalier LS (2.4L ATX that ran 15.9x with some mods) & now owns a 02 Z24 4dr that "feels" almost as fast.
The times I posted earlier are from magazines.
300-400lbs lighter, 20 less HP, 10 less TQ. It's not like that seems so shocking... :p
18's sound like a 2.2L ATX j-body