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Yeah, you're right. Increasing the boost pressure with a remap would give you a louder DV.
Running an open filter would be cheaper though, if you just want extra noise.
The boy around town might be shouting louder?
Try removing the airbox and replacing it with a cone filter, or even an "uprated" panel. It's all about air flow.
It also depends on how the car has been previously driven. The ECU learns and adjusts various parameters to suit. Maybe the car's ECU is just not "used" to being fully extended.
A clip flash would solve this, if so.