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I'm guessing that what you are hearing is the ignition being cut for a very brief amount of time during an upshift. If the car has a sequential shift transmission, or a dual-clutch transmission, the driver keeps the throttle flat to the floor during the shift, but the ignition gets "cut" for a micro-second to unload the gears so the shift can be completed. That is why you hear the "bang" during the shift.
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