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Old 10-05-2011, 09:42 AM   #1
tehskeo
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Exhaust vibration absorber DIY fix

I was at my cottage about a month ago and when I parked my car and started to walk away, I looked back (as I always do ) and I found that there was something hanging from under the car near the muffler.

After much worrying and, at one point, thinking it was a bomb or something, I found out that it was a vibration absorber (P/N 18201433175, #18 on diagram) attached to the exhaust to prevent a rattle at idle:


I found that the heavy damper is merely bonded to the bracket from the vactory, doomed to fail eventually. BMW even attached a little braided metal safety tether in the event it falls off the bracket to prevent it from killing/mutilating/destroying whatever is behind you. Unfortunately, this part is ~$120 or more depending on where you look, so I decided to fix it myself. It's really simple!

Below is a stock part:


The allen bolt is there to clamp down on the safety tether only. My solution was to remove the tether completely and replace it with a large washer which will allow the bolt to clamp the weight and the bracket together. Here is the end result all painted up:



Red arrow is the washer, green arrow is the allen bolt.

Here are a few more angles:




On a side note, the bolts that held the bracket to the exhaust were rusted to the bracket, so when I removed it from the car, both bolt heads were snapped and I had to drill them out and re-tap the bracket.

Last edited by tehskeo; 10-05-2011 at 09:46 AM.
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Old 10-05-2011, 01:09 PM   #2
sproule905
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I believe some M3 exhausts have this, and people do the same as you described above. Mine for instance, does not. But koodo's to the write up!~
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