Well it depends on which Celica you go up against. If you go up against the GT id say you have a pretty good chance cuz i have a I4 mx-6 with intake and exhaust and can beat them. If you go up against as GT-S though you dont have a prayer. My father has a GS-R integra and i can barely beat them in that and im guess just about everyone on this board knows how bad those cars are stock. And anyone who wants to talk trash about hondas and how slow they are ill gladly listen AFTER you beat my dads GS-R. As far as civics go you would run abour neck and neck with a stock civic ex so it would go down to driver skill.