unless there are internal mods like forged pistons then i'd be a little wary if it's really that quick - doubt it would last long
normal tricks are the usual, improved induction, decat, maybe 3" exhaust pipework & up the boost (shouldn't be more than about 12.5psi on standard internals)
advanced mods i think would be tubular manifold, upgraded cams, front mount intercooler (say from a modded Pulsar top mount one) and a T28 instead of the standard T25 turbo
BUT, standard i would be estimating a 7secs 0-60 with around 200BHP, so how he has made it anything near a BPU Supra without going VERY silly with what's been spent on it, i don't know!
get a list of mods for us