It depends. If its civic with a b-series swap from the Integra motors, it should run low 14's depending if its the b18b dohc non-vtec motor or b18c1 motor dohc vtecs. If the motor was in a lighter car such as the hatchback or even the crx's. They can hit mid to low 14's easily with just a swap dohc motors. Adding nitrous of course you'll be in the 13's.
But of course with just the stock civic with its original sohc motors, they'll be anywhere from low 15's to mid 14's running 75 shots.
And a stock Integra either b18b or b18c motors run somwhere in the mid 14's depending on the elevation. Most people I know use nitrous either have good experience because of the condition of the motor and other's have bad experience because they dont take other precaution to lengthen the life of the motor.
From my experience the car you really need to worry about are the one that are boosting. You can tell from the bling chrome front mount intercooler followed by a wooshing sound from their blow off valve.
