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start of with the standard size injectors to be on the safe side and because you're still using the stock manifold and throttle body! i'm assumimg that you are going to have the car tuned, so if they tell you that you can get more power by upgrading your injector size then worry about the injector size, personally i think you should get an aftermarket intake manifold and a larger bore throttle body to get better use out of what you have done internally! and this will also get you a better air/fuel ratio especially if you want to use larger injectors!!