L67 and L32 have the same IFR because they both use a 36 lb injector. when switching to the 42.5 lb injectors you divide 42.5 by 36 or something like that to get about .847. if you are using hp tuners your IFR will be higher because the pcm will pulse the injectors less times with a higher number. if you are using dhp it is the opposite.