How to Deal with Excessive Interior Noise in the Car?
2 Answers
Remove the exhaust pipe and inspect it for cracks or holes; for very small holes, seal them firmly with aluminum foil tape. The muffler's noise reduction principle involves the proper combination of chambers and pipes. If replacing the muffler or repairing the exhaust pipe does not reduce the noise, consider switching to a straight pipe. A straight pipe produces a louder sound with strong resonance. You can reduce the noise by making the outlet smaller.
Excessive cabin noise is indeed quite annoying, and I've struggled with this issue before. There are three main sources of noise: first, tires - uneven tread wear or incorrect tire pressure can increase road noise; second, aging body seals that cause wind noise, especially at high speeds; and third, mechanical issues such as engine carbon buildup, worn suspension bushings, or exhaust leaks. The solution requires targeted approaches: first check tire condition and pressure (switching to quiet tires is most effective), then use seal restorer on door and window gaps, regularly clean engine carbon deposits (older vehicles should have suspension rubber components inspected). A full soundproofing treatment costs around 2,000-3,000 RMB, but DIY installation of soundproofing mats can also significantly improve noise levels for those with good handyman skills.
