Actually nitrous is in liquid form in the bottle.
If you don't purge the line before you make a pass, the liquid turns into a gas, and is less potent.
I think it's good not to purge on street tires. The hit on the tires is more gradual.
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1988 Mustang GT
12.0 @ 121 on radials
S-trim Vortech sitting in a box!
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