Purging removes the air from the nitrous lines so you inject a full dose of nitrous oxide rather that a blip of air.
In a direct port setup, a ratio of nitrous to fuel is created using seperate injectors for each. If there is air in the line, these injectors create a very rich condition. A richer air to fuel ratio makes you slow.
The purge is 100% functional.
I dont use nitrous.
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