0.8 to big???

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I am putting my old W/I kit on my buddys mr2, it used to be on my dsm and i used a 0.8 auaqmist nossle on it. Do you think that that nossle would be to big for his car. It has stock (440cc) injectors and is running 15psi on a stock turbo and intercooler. Also the pump that will be used is a 100psi pump. If so what size should we use?