Hi guys I'm new hear but after some help. I have a 98 spec glanza v which is making a high pitched whistle when at high revs, like above 5000rpm. I fault it might of been my dump valve leaking under boost but I have removed that and I'm still getting the same noise. The car is compleatly standard engine wise and still pulls strong all the way through the revs but its just annoying hearing it. If anyone can shine some light on what thus noise might b I would be muchly greatfull. Cheers, Liam.