High Pitched Noise - Golf Tee Mod?
I have had my 06 330i for about 4 months now and have started noticing a high pitched noise under slight acceleration around 2500K RPM, which stops when the pedal is lifted. It almost sounds electronic, but I do not think it is. I did some searching and see it could be related to the vacuum tube that runs to the exhaust flapper. I have also noticed the flap in my exhaust seems to NEVER be closed, even when the engine is off or just started. I do not know if the previous owner did the golf tee mod, or if the flapper actuator is broken (flapper moves freely by hand) and want to know what the best way is to check this? Any help?
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