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That's why I thought he didn't have a BOV. It sounds like when you let go of the throttle without a BOV, then it creates that 'bouncing' sound effect as the boost pressure tries to escape backwards through the turbo compressor wheel. Even though it's harmful to the turbo, I still think it sounds better than a BOV... It harks back to the days when the Audi Quatro's dominated WRC...*whooooshchiechiechie...*

Also what is their motivation for not allowing atmo BOV's? Unless the turbo is buggered, it can only vent oxygen...