is it the pressure of the nitrous that matters? I thought the pressure was more of and empty/full or ideal situation thing as opposed to pressure in PSI being applied to the motor... i think its the QUANTITY of the nitrous you spray, not the PSI? Not quite sure, but the nitrous at extreme pressures is introduced into the relatively "lowly" pressurized intake tract... i dont think the nitrous spray increases boost pressure, in fact, i highly doubt it.... I think quantity of nitrous here, i.e. the nozzle size or the jets, whatever you do with nitrous... something like that, yeah.