thats the turbo blowoff valve....but i must agree it sounds kinda like sbs bus door...hehe
dun let those ppl who paid that much money to hear us say the psss psss psss sounds like sbs....haha....especially those evos and wrx wannabes.....i still prefer a NA engine....boy, thinking of the mr2 i almost bought a few years back
Blow off Valve, by vitue of it's name, blow off the excess air into the atmosphere to prevent pressure building up excessively when u depress the clutch to change gear....
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