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You can change the shots by changing the jets in the nozzle. Simple as that. You stocksetup should be fine for a 75 shot. You're not using a dry kit which relies on the injectors anyway, you are pulling fuel directly out the rail (or at least you should be) from the pressurized line via a second solenoid. Just read the manual on how to change the jets. Literally takes 3 minutes to do.