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I've noticed this as well, but im pretty sure its just the valve in the exhaust opening and closing.... Havent tried the golf tee mod to see if the noise stops as the valve will stay open.. But that's my assumption..
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Black Sapphire 2011 135i MT6 (Comfort Access, Professional Nav, Heated Seats, Performance Steering Wheel, Performance Shift Knob and boot, and more  ) |