Hi bud thanks for the reply so since writing the post, ive tried afew different things and ive now used the vacuum from the fuel pressure regulator for the bov and its opening and closing correctly but it does make the whoosh noise but its still only quite quiet. Im just stumped as 10 psi should easily produce a noise loud enough to hear while riding shouldn't it? Also would moving the bov closer to the turbo make and noticeable difference in the noise level?