SSC Mazda3s can't get under 2900 legally. There's no way that car could have gotten anywhere near its ITS process weight. So it's classed in ITA lighter than they race in SSC.
Of course that is still with full interior and a/c. You gut it remove all sound deadening, stock exhaust, rear parking brakes and cables and ditch the a/c. I would guess that would knock off at least 400lbs.