머플러 교환 수리 사례
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소요 시간
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2026. 6. 30. 작업
난이도 & 준비물
증상
What is the muffler? How does it work?
처리 내용
A muffler is a harmonically tuned chamber that is designed to reduce the noise created by the combustion process. Mufflers are usually designed with specific sound frequencies in mind. When a vehicle is being designed, the engineers will measure the sound frequencies emitted by the engine, and using harmonic tuning, create mufflers that specifically cancel certain frequencies, and amplify others (ie in a sports sedan, you want quite exhaust at low throttle/low RPM, but louder exhaust at high throttle or high RPM). The image below is a cutout of a typical muffler. You can see the exhaust gasses and sound waves will enter (on the left) and exit (out the top). The baffling allows the exhaust to travel the path of least resistance (once pressure has built), while forcing the sound waves to bounce around through the various tubes and chambers, thus canceling the desired frequencies. The volume of the sound baffling chambers is why mufflers are as large as they are. If you were to drill a ho
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My 2005 Buick Century with 353k miles gets a recurring P0420 code, catalytic converter operating below efficiency level. Twice this year, I tried using Cataclean, but with no success. I noticed a small hole in my muffler at the seam. Could a lack of exhaust back pressure cause the CC to operate inefficiently or improperly? Can anyone recommend a catalytic converter cleaner? Or, is it all snake oil?