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      06-21-2015, 09:15 AM   #1

Drives: 650i
Join Date: Feb 2014
Location: Earth

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Exclamation Muffler Discoloration - Is this Normal?

Hi Guys,

I tend to inspect the car, especially the tyers, every now and then and I noticed inconsistent discoloration of the right muffler when compared with the left muffler.

The left muffler is basically intact and as new whereas the right muffler is clearly turning brown/golden color (image attached).

Now I understand this discoloration is due to heat, but, why the inconsistency between the right and the left hand side?

The dealer inspected the car and as usual their response was: This is normal and nothing to worry about

Has anyone noticed such discoloration? any thoughts?

Car: 650i 2014 coupe
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      06-22-2015, 03:43 PM   #2
Lieutenant General
South Africa

Drives: BMW
Join Date: Apr 2005
Location: South Africa

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Yes, they do that.
Different metal parts change color at different rates due to various reasons.

Here is a picture of aremoved 550i exhaust I found on the net showing the typical color changes that happen over time
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BMW if you are reading, I need a job, Please.
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