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It is the wastegate doing what it's supposed to, with an electronic boost controller that I believe is pulse width modulated. Once you get above the wastegate's spring pressure the EBC takes over and this is what it sounds like, especially at low boost. As for the RPM that he's winding it out to...well mine hits the rev limiter at 8800-8900rpm...so it's safe to assume that's about where he's going!
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