400cc in a kit seems like plenty for that sort of power, but im surprised theres no pump upgrade but if its a well known kit i wouldnt worry, except that you wont have a warranty anymor but the year of the vehicle isnt specified so maybe you dont have one anyways
a hahn stage 2 kit with a s16g for talons, eclipses, and neons use a booster pump and STOCK injectors of only 190cc to make around 275 crank horse, extremely low cc’s for boost applications, but somehow it works, 400 is plenty unless its something you picked offa ebay for 900$