An exhaust that is close to the noise limit can be reduced by fitting inserts in the tailpipe provided it is straight for enough length for the insert to fit inside / outside. Jetex and Decibel Slayer are the two brands available.
Easiest way to quiet an exhaust is to point it at the ground with a tip. The ground will help absorb the high frequencies. Another tip don't dump under the vehicle it resonates in the space, dump it outside the car past the rocker pointed at the ground.
The State of California requires that vehicles have an adequately working muffler, which means you cannot remove or make adjustments to your muffler that intentionally increase the noise of the vehicle.
Mufflers designed with limited baffles also can increase the sound output of your vehicle. Add a sound-amplifying exhaust tip. Exhaust tips with dual walls, flared ends or large diameters may increase the sound volume of the exhaust output. Increase the size of your exhaust pipes by 1/2-inch to 1-inch in diameter.
Performance Silencer
As previously stated, the silencer has an impact on the engine's noise. An enhanced silencer can enhance engine performance by decreasing resistance and boosting the flow of exhaust gases, all while creating a louder and more powerful engine sound.
A recent option is a silencer for valved exhaust systems. These flow through a non perforated section giving best flow and no additional silencing when the valve is open. When the valve is closed the gases flow through the perforated section of the silencer. This allows two options of flow and sound.
The noise is reduced by forcing the exhaust air to pass through a series of tubes and chambers. Each element in the muffler has sound reduction properties that vary greatly with acoustic frequency, and it is the mixing and matching of these elements that constitutes muffler design.
Interesting but unsurprising to know about California, but I have no reason to ever travel there via classic car, or really for any reason at all. > If they live in the United States of America there is no state where straight pipes are legal for road use.
Putting holes in an exhaust system's muffler can work to amplify the sound of a vehicle's exhaust. By drilling holes into a muffler, exhaust can escape from other places, making the expulsion of exhaust sound much louder.
A larger diameter pipe can enhance the deepness of the sound by allowing exhaust gasses to flow with less restriction, creating a resonant, deeper tone. For a more aggressive approach, removing components like the catalytic converter or muffler will result in a much louder sound.
If you drive with a bad silencer, it has safety implications for you and your vehicle, and it could make you vulnerable to fines or having your vehicle towed. If your silencer is visibly damaged or your exhaust is louder than it used to be, don't delay.
The main types are: Reactive silencers, mute sound by bouncing it around inside one or multiple chambers. This design works best for low to moderate noise level demands. Absorptive silencers are used in more demanding environments and have a greater sound attenuation rating.
Getting a muffler or a resonator can help minimize a vehicle's noise.
Wrap the pipes
Besides mitigating heat coming off the exhaust pipes, an exhaust wrap can also reduce the volume of your exhaust. This is because the materials used in exhaust wraps, such as fiberglass and stainless steel, have some sound deadening properties.
A cold air intake is one of the best options for getting a resonant, deep-sounding exhaust note from your vehicle. When you rev your engine and finally release the throttle, you'll hear the sound of air flowing through your intake and changing the notes of your engine to a louder, more aggressive sound.
No person shall modify or change the exhaust muffler, the intake muffler, or any other noise-abatement device of a motor vehicle in a manner such that the noise emitted by the motor vehicle is increased above that emitted by the vehicle as originally manufactured.
If you are considering a resonator delete, it's important to ensure that it does not result in excessive noise levels that could result in a fine or legal action. Additionally, it's important to ensure that the modification does not affect the car's emissions, as this could result in an MOT failure or legal action.
Muffler deletes typically cost between $100 and $200. The exact cost will depend on the make and model of your car. Some cars are easier to modify than others, so the cost can vary depending on the difficulty of the job.
Does Straight Piping Increase HP? It depends on the application and the vehicle. A straight pipe exhaust will increase the output in performance engines that need to breathe more freely. For other types of engines, the horsepower gains with an exhaust system are limited.
A muffler delete could potentially do more harm than good. You won't damage your engine without a muffler, but if you don't know what you're cutting or removing you could damage internals or other important components.
Water pipes are not drug paraphernalia if they are imported for use with hookah tobacco (shisha), or waterpipe tobacco. But, if they are primarily designed or intended for use with a controlled substance, then they become drug paraphernalia.
muffler. muffler, device through which the exhaust gases from an internal-combustion engine are passed to attenuate (reduce) the airborne noise of the engine.
A larger muffler will typically control sound better than a similar smaller unit. “For an absorption-style muffler, the packed volume is a strong predictor of muffler performance—the larger the muffler, the more sound attenuation is achieved,” explains Vince Roman of Burns Stainless.