Internal combustion engines usually make a lot of noise while they are running, and this noise can be annoying and exhaustive to your ears, especially when it is heard for a long period of time. Thus, mufflers were created to reduce the noise generated by the exhaust system. Exhaust resonators, meanwhile, further reduce the noise by making sound waves that cancel noises out.
A typical automotive exhaust resonator is made of a hollow steel cylindrical tube and is attached to the muffler of an exhaust system. This type of resonator is designed similar to that of an acoustic resonator, which creates an "exhaust note" that gives the exhaust noise a less annoying and more pleasant tone. The sound can be enhanced by means of adjusting the exhaust note.
Exhaust resonators are usually add-on features in exhaust systems. They are placed together with the mufflers along the exhaust pipe and work primarily to decrease exhaust noise. The exhaust noise passes through the resonating chamber, which in turn tunes the sound to cause destructive interference in order to be cancelled out by the opposite sound waves.
Being an add-on device, exhaust resonators are provided by aftermarket manufacturers and can be installed on muffler systems of internal combustion systems, such as automobiles and motorcycles. Some vehicles already are equipped with tuned exhaust systems with resonators, thus making the exhaust pipes capable of pulling the combustion products out of the chamber faster with reduced sound. Most aftermarket producers improve the exhaust tuners, as these help the vehicle perform more efficiently.
Exhaust resonators provide a wide array of benefits to vehicle owners. Aside from reducing the noise from the engine's exhaust system, resonators also enhance overall engine performance and smoother driving because more horsepower is yielded without wasting as much fuel. Noise suppression also helps in passing fuel emission tests, as the resonator prevents chassis rattling, an effect that usually leads to contaminated fuel emissions.
Aside from exhaust resonators, catalytic converters also are part of the overall exhaust system to help the muffler perform its function of reducing exhaust noise. However, instead of cancelling out each other's sound waves, their effect is to restrict the sound coming out of the exhaust pipe. Catalytic converters work hand in hand with exhaust resonators in reducing and suppressing engine noise, thus allowing the vehicle to achieve optimum engine and driving performance as compared with using mufflers alone.