There are only so many factors that effect track times, power, weight, gearing, traction, and driver experience. Power and weight are two of the big ones.
what I am saying is that those times would be hard to pull without nitrous. I, and anyone else who knows basic math, can tell you though, if a turbod CSVT runs a 13.2, a NA contour would need pretty close to the hp of the turbod car to make a time of 13.4. Building a 2.5 l duratec to those hp specs without turbo/super/nos would be a stretch.
That is just me making a statement based on experience and observation.
If he did pull those times, more power too him.
