If you mean the wastegate operation sound, that has to do with the wastegate duty cycle set within the Ecutek tune. Since James doesn't lock his tunes, you can edit this value yourself. He typically has his tunes set to 10, but you could experiment with higher numbers so the wastegate operates "faster" in that it opens and closes faster producing different sounds. I believe the map is called the "CPC Duty Multiplier" map, and Ecutek's tuning PDF has a section on this and they recommend 20-30.
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