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You want your bottle pressure to hit 950 psi. So a bottle heater will help you reach that psi level for opt nitrous flow. Hankfan had suggested that to Rob when he first got his juice and according to Rob, it made a world of difference to him.
You must have a bottle heater in order for nitrous to work properly. I tried it first without a heater and was really disappointed. Then I installed the NX bottle heater and WOW what a difference.