I doubt he is talking about that, a whistle and a rattle are to 2 distinctly different noises.. The turbo on my Mk5 GTI is quiet loud and its just standard, its audiable with the windows down or if your driving next to a cement wall/ tunnel.. I was surprised by this as i had driven a few other 2.0tsfi (in an audi A3) and there was no turbo sounds.. Is this normal? even my g.f noticed the noise one night..