rubbish, impeller stall isn't good. if you're fussed about not wanting the noise then fit a recirculating one. turbo'd engines (especially tuned ones) need dump valves.
a wastegate doesn't make a noise, what you can hear is the inlet charage surging backwards through the induction system and being chopped up by the impeller - whilst doing that it's trying to fire the impeller out of the compressor housing.