15 maybe.... why would you put nitrous on a no modded car? do you have any internals? cams, gears, udp, exhaust?/ anything, or just a cia? wouldnt run the juice on it for too long without building the motot up some, but thats just me tho...
mid-low 14s if you get traction. Maybe a high 13 if : you have traction, your transmission shifts hard, and you can get away with spraying on your launch (@2500-3000rpm).
I doubt you will be able to spray that soon though unless you have a higher stall torque converter, cause the factory one won't let you go that high I don't think.
The full of heavy junk (wing, body, heavy wheels) Saleen S121 2.0L ran a 14 flat with intake, exhaust, and a 75hp shot.
Put rubber coil spring spacers in your rear springs at the track, make sure you have sufficiently low tire pressure in the front, and make sure you have good sticky tires, and you will be a world ahead.