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I deactivated the exhaust valve on my F30 328i. It is electrically operated instead of vacuum powered so the golf tee method will not work. However, it is just as easy. There is a spring clip that connects the actuator to the stem on the butterfly valve. Just remove the clip. Then use a piece of wire or some epoxy to fix the butterfly value in the open position. It makes a little difference but not as much as I hoped - almost barely noticable sound increase. So I did some exhaust system modification to make it louder and now it sounds very good. Good tone and volume and no resonance.
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