Video: How a car's muffler works
 

I chopped open the muffler on my Corolla. I made a short video explaining how it works:
Here’s a few photos of the process:

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How it all works inside:



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Sound travels as a wave in the exhaust stream, with a wave length of lambda: Attachment 491686

In the perfect world, all waves would destructively interfere:

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I was surprised that this muffler has a passive spring loaded door:

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Nice work! Subscribed.

Good stuff, that's not stainless steel.