Boost Leak or Timing Belt?

[EvoVIII]

this past week, i notice my car is making some weird noise at High RPM, I am not sure if that's some kind of boost leak, weird sound comes on at about 5000+RPM, or there is something wrong with my timing belt, where is the best place to go for the check up?? WORKS maybe?? or should I bring it back to vishnu?

[jspenc2]

Hey this reply may be a little late but I have the same problem at 6000rpm exactly in third gear have you had any answers yet? I had a greddy type S the first time,.. I just bought the greddy type RS and i VTA both times and it sounds like the BOV is opening up and leaking boost,.. the weird thing is ,... the BOV will hold 19psi the whole way and of course drop to 16lbs in every gear,.. but when 3rd hits 6000rpms, the noise begins, sounds like slipping belts at first,.. then if you listen closely, it does sound like the BOV letting air out like its wide open,.. car doesn't acclerate until I shift into 4th its like a "vacuum limiter" anyone know anything about this???