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Q: Do I need a purge kit?
A: A nitrous purge kit clears the delivery lines of unwanted air and vapor and guarantees immediate power from your nitrous system. It’s also used to intimidate your competition and shows the world your nitrous equipped. The ZEX™ purge kit (part #82010) uses the industry’s largest solenoid, creating an awesome purge cloud.[/FONT]
http://www.youtube.com/watch?v=JrbvMyHUNvc
http://en.wikipedia.org/wiki/Nitrous
you can get a fake purge kit to make it look like you have nitrous and look tacky for failry cheap