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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > Hope someone can help diagnose this noise
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      06-16-2017, 08:40 PM   #1
pentagon
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Hope someone can help diagnose this noise

Hi

So...since last weekend, my car started to make this high pitched noise....
i believe it's coming from the exhaust, since when i put my foot on the muffler, the sound disappears. It only happens after the car is at operating temp and stopped and it usually disappears after i give it some gas. The noise is intermittent and it's very hard to pinpoint what is causing it. I have attached a video for reference, the sound starts at around 4sec

The exhaust in question is the active autowerk signature exhaust btw

https://youtu.be/D6w8AFXepwY
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      06-16-2017, 08:45 PM   #2
Katin
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Foot over one pipe or both? Could it be the exhaust valve?
The harmonic sounds like an exhaust leak related to the turbo.
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      06-16-2017, 09:34 PM   #3
pentagon
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I only tried putting my foot on the muffler itself...looks like I have to bring the car back to shop to see if they can re tighten everything
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