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2013 Forester Sport Style
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Discussion Starter · #1 ·
As object, had a rattling noise issue, gone underneath and identified the guilty quite easily, it was inside a squared metal box, and at a certain rmp range it produced the sound
Please help me identify it as i would like to avoid to go to service without a real reason

it's a sturdy, heavy piece of metal, upper part is in some sort of rubber
Rectangle Cylinder Artifact Gas Art
 

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2014 2.5i Limited CVT
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A few things -

It would help to know what kind of vehicle we're talking about - and what year.

It could also help to know where you found this piece - beyond "in a square metal box". If you cannot describe it, pictures often help.

Finally, this could easily be a piece of some other vehicle that was kicked up on a trip and is not really a piece of your car but of somebody else's car.
 

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Discussion Starter · #6 · (Edited)
Hi Guys,
Yes, i will update the profile in short time, sorry about it. Edit: Done
I have another picture. It is definitely a piece of my car, it was meant to be attached to a internal side of the box you can see in the center of the picture, placed under passenger seat, definitely related to exhaust, the cylindric piece has not pass trough hole
Plant Gas Vehicle Auto part Automotive exterior
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2008 LL Bean (4EAT)
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The exhaust on my BMW Z3 has a heavy metal and rubber damper part hung off of it that is called a vibration absorber.
The OP's loose part from inside a metal box could be a damper mass that came loose from inside the box in his photo, the whole thing being a vibration absorber assembly.
Here is an enhancement of the OP's photo of his exhaust:
Vehicle Automotive exterior Gas Auto part Automotive tire
 

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Discussion Starter · #8 ·
Yes it looks like a counterweight, no electronics but it would be reassuring to know exactly its function and if it's safe to leave the car as it is and just consider to have a new fancy paperweight
another pic of it :
Automotive lighting Automotive tire Gas Electric blue Font
 

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The photo shows no hole through the rubber center, and the steel shell is unusually thick and heavy, and is painted.
This rules out that it might be a pressed in rubber mounting bushing. It is mostly likely a damper mass that has come unscrewed and should be easy to put back on.
A vibration absorber would be part of Subaru's effort to reduce noise, vibration and harshness.
 

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Discussion Starter · #10 ·
it seems legit, nevertheless the piece has no thread, it looks like the "rubber" (epdm should be a plastic alloy of some sort as i assumed by google) has simply ripped off, the piece is full metal, the epdm is just a thin layer on the top
 
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