Limit a Loud Exhaust
A vehicle’s exhaust system is designed to transport the exhaust gases produced by combustion to a place safe for release. During transport on more modern vehicles, the gases are guided through a catalytic converter which alters noxious gases to a less toxic state. The gases are then guided through the muffler to dampen sound through resonance and sound-absorbing materials and finally are ported through the exhaust pipes. To limit the sound of a loud exhaust, alteration of the exhaust components or restriction of sound waves is required.
1. Attach a resonated exhaust tip to the tailpipe. This may require replacing an existing exhaust tip. A resonated tip is lined with fiberglass or other sound-dampening liners. As sound waves pass through the lined tip, the waves are absorbed by the material, and the exhaust sound is reduced.
2. Install sound-dampening material in the cabin of the vehicle. Sound-dampening sheets are designed to absorb vibration and sound. Lined against the sheet metal of the vehicle cabin, the dampening layer acts as a shield to external sounds and vibrations from the exhaust. The sound-dampening mats or sheets should be installed under the carpeting, in the frames of the doors against the metal and, if possible, against any framing surfaces (behind the ceiling liner and on the inside of the dash). When installed, the dampening materials will limit exhaust noise, decrease road noise and add to the clarity of sounds in the vehicle (such as stereo music or occupant conversations).
3. Add a sound-reducing muffler. Mufflers designed with sound resonance chambers or baffles and have sound absorbing materials will reduce the sound waves produced by the exhaust. If you have a dual exhaust system (the exhaust output from the engine cylinders is separated into two complete paths), you can install a dual-in muffler system. This will allow the exhaust gases to collide in a single muffler and cancel much of the noise produced by two complete exhaust systems.
4. Install sound-dampening, high-temperature wrap around the exhaust. Sound dampening exhaust wraps reduce the transfer of vibrations to the vehicle and will limit the amount of sound in the cabin.