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I have 120d f20 as well, and when I push it to the limit, and than drop the accel pedal, I can hear it blowing off. And some times not in one step but in clear 3 steps. It has nothing to do with gear switching. Blow off simply lets the air out when you stop accelerating, similar thing happens while gear-shift. If you have turbo, you can have it. For 120d f20, I was not able to locate it on real oem, even though 125d has it clearly because it is twinturbo and pressure is higher =)
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