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If you are at max boost it is probably relieving excess pressure. I have a twin scroll in my JDM STi swap (not a BRZ) and it makes all kinds of noises at many different throttle pressures/rpms. The only time it's not dumping pressure is on the inital acceleration but as soon as the first stage spools up it hisses a little and then when the second stage kicks in it makes a fluttering sound and the when I back out of the gas to shift it dumps even louder. So yeah it's probably normal. If you have a boost gauge you probably notice the noise starts around your max boost point (although there are many varibles).
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