It already has one fitted, but it is a recirculating one so you won't hear the chavvy whoosh. You can fit a vent-to-atmosphere valve, but make sure it is a twin-piston type otherwise you may suffer erratic idling and jerky liftoff.
or try what I did and just remove the hose that runs from the recirc valve, so in essence, it turns into a vta....problem is my fuel consumtion went to about 10mpg!...but it wooshed. Needless to say it's back to standard now.
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