I belive its a bov [blow off valve / dump valve] it has lots of names. Its a replacement for the standard recirculating one, it makes a phssssss noise when you take your foot off the gas venting the air from the turbo into the atmospheire. Dont no that much about what gains you get from it unless you have tuned your car.
Can't use a dump valve on these cars, you can get a shiney recirculation type.
J
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