Your car has a silencer for a good reason. If not, the sound of your escape would be very loud. A silencer, well, muffles that sound. It does it in a simple but ingenious way. Of course, no silencer lasts forever, and yours will finally succumb to heat, exposure and deterioration. It will need to be replaced at some point.
How the silencer worksSaying that a muffler damper explains how this automotive component works without really telling you much. It's more about how you muffle the sound. The inside of your silencer is not empty; it is actually full of tubes, channels and holes. They are arranged in such a way that sound be directed through the system, losing energy as it travels.
Of course, that is an oversimplification. Actually, there is a lot of technology incorporated into the humble car muffler. The interior of the silencer is designed not to muffle the sound, but to combine the sound waves and cause them to cancel each other out. To achieve this, the internal tubes, holes and channels must be perfectly aligned or the sound waves will simply bounce over each other, which would not reduce engine noise.
There are four sections in your silencer. The entrance is the part that connects to the rest of the exhaust system, and where the exhaust gases and sound come in. The resonator chamber is where a cancellation sound wave is created. Then there is the second section, which is where you will find two perforated tubes that further cancel the sound. Finally, there is the output, which emits both the little remaining sound and the exhaust gas.