i thought the LS was the base model.
As Egz said, take it to the track to find out for certain. But as Egz has proved, the 2.3 can pull off some great #'s with just a CAI. So if you are both equal in driving skill, i think you will probably take him.
"Jam Harder, Penetrate Deeper, Dispense Longer"
"In God we Trust, All Others we Monitor, Jam or Deceive"