what does the nozzel on top of my s/c do?

[soldierboy1218]

What does the nozzel on top of the s/c do? it looks like an air nozzel can i add air? or remove air to get more out of it? if anyone has any idea please let me know, its a 2006 GP GT with the Eaton S/C

[Liquifire]

if you want this answered please post this in the general tech section or under the supercharged motor sections below....