Hmmm tough to say really... What kind of tires do you have, and have you ran the strip before? I dont know what kind of HP you are putting down but I think 12's is a little difficult for sub 300 hp? I have no clue what the procharger @ 8psi does to the svt though so i dunno.
I would say low 13's though as my guess (slightly uneducated without more info but thats what it is! :) )
Best of luck to ya
2003 SVT ZX5 Pitch Black # 1117
Borla/ SCT/ Stg II ported TB/ ORP/ STS/ K&N/ VF mount/ Drilled-slotted rotors/ Hawk HPS/ Hofele grille/ Kyowa 18's & 215/40/18 BFG G-force sports