this isn't the place for this type of question. this is a tech forum, not a what if style forum...
but, for th record,
its all speclation at best.
i've seen stock gsrs run 14s, and i've seen em run 17's.
your car, your driving, your track, your traction, your wind, your temp, your humiduity, and 23123123 other factors will all effect this time.