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I think you can get chatter on a forge DTA DV but you have to restrict the air output with a hose clip or something to get the chatter. Other than that they all go Thskkkkkkkkkk!
I've got a HKS for sale but no chatter, it just whistles.
I thought the whole point of a dump valve was to reduce wastegate chatter, surely to get chatter the easiest thing to do is close the loop and not have a dump valve at all?