Ok to get into the 12's you will most likly need to change the stock turbo.
I would go like this
exhuast + dump + front pipe (no need for screamer)
Air filter ($100 K&N)
FMIC (hybird 600x300x76 $400-$500 + piping)
Greddy Plenum (option really, just cut down on piping and is only good if ur aiming for higher power lvls $1200)
Ecu (power fc, wolf3d, motec etc, depending on the tuners in ur area will depend on what u get really if you have a good pfc tuner i would take that over an average wolf tuner) (PFC should cost you around $1300 inc hc)
EBC (apexi, hks,greddy price $500-$800)
Turbo i would go HKS GT25 (or highflow stock turbo) both i have seen good results and making a r33 run 12's
injectors i belived 550 would be the best for the power you would be aiming for
Just something to think about i have been told that pushing as stock r33 engine over the 300rwhp becomes risky and can results in damaging the engine really easy. Also you will be clutch and stock upgrade, and also bigger tyres than stock to make it easyer to get traction
thats all i got for now, hope it helps.
Ohh yeah 12's isnt easy, drag racing isnt easy i ran a best @ 14.3 with 170rwhp (est i would say be around that mark) i could do better now the car is runing better etc, but getting the power to the ground is always the problem.
Autobox i would add cooler on it, do a serach heaps of info on r33 auto boxs.
ohh yeah and if u are using an r33 for drift, u need a 5spd auto wont cut it
mike