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BMW 5-Series (G30) Forum Engine, Exhaust, Drivetrain, Tuning Modifications 2018 M550i exhaust rattle

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      03-11-2021, 02:48 PM   #1
Sam_M550i
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2018 M550i exhaust rattle

Hi all. Anyone hear a slight rattle during start up and light revs from their exhaust?
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      03-14-2021, 04:32 PM   #2
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I'm not sure if it's the same on the 550, but check your clearance over the rear cross support (just in front of the rear diff). I had some rattle issues after fitting my downpipe and had to lift it slightly.

The other thing that can rattle is the MPE exhaust tips. Not sure if you have those, but if you do, give them a slight rap with a rubber mallet to check if they are causing it. They have an outer shell that can rattle against the interior casing.
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      03-17-2021, 02:07 PM   #3
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So the noise seems to be coming from just about the middle or maybe little towards the front under the car. It is a metal rattle sound.
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      03-17-2021, 04:30 PM   #4
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So only during startup.. not driving?
Have you done any mods?

Just drop into an exhaust shop or dealer and get them to put it on a hoist. Once you can get comfortably under the car, those kinds of issues are usually identified and sorted out fairly quickly.
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      03-20-2021, 06:24 PM   #5
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Okay so this rattle is only heard during cold starts and when revving to 2k or so rpm.
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      03-28-2021, 02:10 PM   #6
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      03-29-2021, 04:35 AM   #7
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I do have a minor rattle which sounds a bit similar in mine. Most noticeable on a cold start and at low revs like you noted. As I've only ever really noticed it when I'm in the car I've not been able to find where it's coming from. It sounds like it's near the rear of the exhaust
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      03-29-2021, 07:42 AM   #8
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Car currently at the dealer to figure it out. They could t hear it when I arrived as the car was all warm. Tech says it might be normal during cold start as the flaps on the turbo are not meant to be tight.
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      03-29-2021, 09:25 AM   #9
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That's probably wastegate rattle if it's in the middle of the car, common in a lot of BMWs. There's no easy fix tho, just gotta live with it when car is cold
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      03-29-2021, 03:24 PM   #10
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Dealer got back and said that the noise is totally normal, common mostly when the weather is colder outside. It is due to the wastegate.
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      04-29-2021, 05:33 PM   #11
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I know the dealer said this is normal but damn its annoying. Sucks for a car of this caliber to make such a noise.
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