How to Solve Excessive Exhaust Noise?

[Vivian]

You can apply a high-quality sound-absorbing foam material under the engine hood, which can both absorb and dissipate a significant amount of engine noise and suppress the vibration of the hood. Install sound-absorbing cotton material at the bottom of the trunk and on the wheel arches on both sides of the trunk, which can effectively reduce tire noise, road noise, and the noise from the three aspects of the exhaust. Sealing strips can fill the gaps, tightly connecting the doors, rear trunk lid with the car body, enhancing the vehicle's airtightness, and effectively reducing the entry of air noise into the cabin.

[LaNolan]

Recently, my car also experienced excessive exhaust noise, which was mainly due to exhaust pipe issues. First, check if the exhaust pipe gasket has aged and is leaking—the puffing sound is particularly noticeable. Last time, I solved it by replacing it with a new stainless steel gasket. Also, carefully inspect the rubber hangers of the exhaust pipe; over time, they can harden and crack, causing the exhaust pipe to rattle when the car bumps. If the car is older, the internal baffles of the muffler may have rusted through, requiring a complete replacement. Another small detail many overlook is the fastening screws of the exhaust heat shield—if loose, they can cause resonance. Lastly, if the exhaust has been modified, misalignment of the tailpipe position might increase noise, requiring readjustment of the installation angle.

[OMia]

When the exhaust noise suddenly becomes louder, I recommend a three-step inspection. First, use a flashlight to check the welds and joints of the exhaust pipe when the engine is cold, looking for cracks or rust holes. Second, after starting the engine, listen carefully at the rear of the car; if there's a metallic rattling sound inside the muffler, it's likely due to detached internal baffles. Third, pay attention to the noise pattern while driving: a constant humming usually indicates failed exhaust hangers, while a sudden roaring during acceleration may suggest a leak at the joint. Last month, I dealt with this issue—it was simply due to hardened, aged rubber hangers. Replacing all four hangers for just a few dozen dollars immediately restored quietness. Modified exhaust enthusiasts should be especially cautious, as improper backpressure design can cause low-frequency resonance.

[KhloeDella]

Last time, the mechanic told me that exhaust noise is most likely a mechanical issue. The exhaust pipe itself is the most prone to problems: in older cars, the muffler can rust and develop holes, requiring a complete replacement; if there's a leak at the exhaust pipe joint, black carbon deposits will appear at the connection, and replacing the gasket can fix it; if the exhaust pipe mounting bracket is broken, the exhaust pipe will hit the chassis when accelerating. Additionally, if the exhaust heat shield comes loose, it can rattle, and simply tightening it will solve the issue. For example, in my car, the exhaust routing wasn't perfectly aligned from the factory, and long-term vibrations caused the mid-section of the exhaust pipe to rub against the frame—adjusting the installation position made it much quieter. Remember, if you notice unusual noises, get them fixed as soon as possible, as prolonged vibrations can also damage the engine mounts.