there are no published figures for it. I think the standard celica 190 does 0-60 in 7.2seconds but people reckon thats a little underestimated.
the sport M has many extras but a few that might help the 0-60 are TRD suspension, TRD clutch (its a bitch to use), LSD, lightened (sound deadening etc removed as standard), extra welding, strut braces etc.
The engine is modified by TRD too and are quoted to have an extra 10BHP and around an extra 10Lbft of torque.
Mine is completely standard so far... wheels are on the menu. I havent stripped it out yet, i think i just had the seats down to carry a box!! lol