ok quick vacuum line to dry nitrous kit lesson. lets say your car idles at 36 psi, at wot, zero hg (no vac) your gonna get lets say about 48 psi of fuel pressure. you unhook the vac line to the fpr and your getting a constant 48 psi. with the nitrou kits the vacuum line fomr the solenoid, or in the zex kit, the purple box, it put positive pressure into the for, kinda like boost, letting the presure go as high as needed. with the nos brand kit theres a seperate nitrous jet that controls that pressure. you can ith that change the amount of fuel pressure your getting when the nitrous turns on

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