it's a small solenoid that connects to a nitrous solenoid and you use it to clean out nitrous lines of nitrous that has been sitting in the lines. it allows for more of a nitrous "hit" when u actually engage the nitrous and can give u a couple tenths in the 1/4 just from using it. plus it's loud and makes a cool cloud allowing you to show off, which is what it's used more for anyway.
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