The article does go on to say that "we have no doubt the V-6 Mustang with ProCharger's blower will easily cover the quarter-mile in 13.5 seconds at 101-102 mph, provided weather conditions are better thant the heat card we were dealt, and certainly if the car is equipped with a free-flowing dual exhaust."
They also say "At this point, we wished our test Stang had been equipped with a five-speed transmission, because it was clear that the mph figures for the blown version and the all-motor V-6 passes were hindered by the AOD and the factory shift references in the PCM (transmission shift adjustments were not made with the Predator for this test).
I don't know why they didn't properly tune the automatic tranny if the system comes with a predator though as I think it might have made a difference in the ET.