Well it makes sense they are 36# injectors stock (sounds a bit high but close enough) because for example ZZP makes ~400WHP with the Eaton M90 blower (It'* max limit). 36# injectors are basically good up to ~400WHP, so it basically makes sense. When the factories do injectors, there really is not that much difference in injector designs. The only difference is the size of the holes to determine if its a 21# or a 36#. Not like the injector is actually bigger or something. GM put a bigger injector for saftey because when the injector gets older, it could get clogged a bit so it loses some of its spray capacity, by having a bigger injector can compensate for that and not have any worries about motor'* blowing up. Also have a bigger injector because the */C cars run richer in order to make sure it does not blow up since these engines dont have intercoolers so the */C. So the air inlet temps are very high so run a rich mixture to make sure does not detonate from the hot air inlet temps. Hope that kinda makes sense and put a little light bulb over everybody'* head.