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      10-31-2019, 11:13 PM   #5
strripedz
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Drives: X2 F39
Join Date: Nov 2018
Location: Melbourne

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I definitely agree with rr.
I could hear the hissing noise, but its only when the car hits the boost (around 3k rpm and above).
Then it is followed by BOV once I let the throttle go at higher rpm range.
That being said, the noise is consistent throughout the temperature doesn't matter if its cold or warm engine.
Appreciate 0