Lena Torres
High-flow catalytic converters, or cats, are aftermarket modifications that increase the flow of gases exiting a car's engine. This can have several effects on the car, including increased horsepower and a louder exhaust sound. The change in sound can be a result of the higher flow of gases, as well as a higher pitch due to the length of the primary tubing being altered. While some people prefer the louder exhaust sound, others may find it too obnoxious and opt for a quieter option. The type of catback exhaust system used can also impact the overall loudness of the car.
Do high-flow cats increase sound?
| Characteristics | Values |
|---|---|
| Do high-flow cats increase sound? | Yes, high-flow cats are less restrictive and allow more sound to pass through the exhaust system. However, the increase in sound may not be significant. |
| Effect on performance | Removing cats may result in a loss of back pressure, impacting low-end torque and acceleration. High-flow cats may provide a slight increase in horsepower. |
| Drone/Rasp | High-flow cats may help reduce drone and rasp, but good mufflers are recommended for further reduction. |
| Smell | Removing cats can cause an increase in exhaust smell. |
| Emission impact | High-flow cats can pass emissions tests. |
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What You'll Learn
High-flow cats are louder than stock cats
High-flow catalytic converters, or cats, are indeed louder than stock cats. This is because they are less restrictive, allowing more sound to pass through the exhaust system. However, the difference in volume may not be significant, and it may only be noticeable at wide-open throttle. Some people even report that they couldn't tell the difference in sound between stock and high-flow cats.
The level of sound increase also depends on the type of catback exhaust system in the car. For example, a Magnaflow catback system with high-flow cats will be louder than stock, but it may not be obnoxiously so. On the other hand, removing the cats altogether will make the car significantly louder, and it may also cause a strong, unpleasant smell.
It is worth noting that while high-flow cats increase the volume, they change the tone by altering the length of the primary tubing. This means that the higher pitch may make the car seem louder than it actually is. Additionally, some people report that their cars feel slower with stock cats due to the loss of horsepower caused by back pressure.
In conclusion, high-flow cats are louder than stock cats, but the difference may be minimal, and it depends on other factors such as the type of catback exhaust system and the length of the tubing. Other considerations when choosing between stock and high-flow cats include the level of restriction, horsepower, and potential for unpleasant smells.
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Removing cats makes the car louder
Removing catalytic converters from a car will make it louder. However, the increase in sound may not be significant, and the car may only sound louder because of its higher pitch.
One user on a Mustang forum noted that their car did sound louder after removing the catalytic converters, but that it also felt slower to accelerate. Another user on the same forum confirmed that their Mustang also sounded louder after removing the catalytic converters.
Other users on a Corvette forum have also stated that removing the catalytic converters from their cars made them louder. One user claimed that the sound increased from a 10 on the loudness scale to a 7.5 after adding high-flow catalytic converters. Similarly, another user on the same forum noted that their car became too loud after making modifications that included removing the catalytic converters.
It is worth noting that removing catalytic converters may also cause a strong, unpleasant smell and could be illegal in certain jurisdictions.
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High-flow cats can help reduce exhaust smell
High-flow catalytic converters, or "cats", are aftermarket modifications that can be made to a car's exhaust system. While they are often associated with increased sound and performance, one of their lesser-known benefits is their ability to reduce exhaust smell.
The primary function of catalytic converters is to reduce harmful emissions from a car's exhaust. They do this by converting toxic gases such as carbon monoxide (CO), nitrogen oxides (NOx), and hydrocarbons (HC) into less harmful substances through a chemical reaction. This process helps to reduce air pollution and can also improve the smell of a car's exhaust.
In some cases, the stock catalytic converters that come with a car may not be sufficient to handle the amount of emissions produced, especially if the car has been modified for performance. This can result in an unpleasant exhaust smell, as the catalytic converter becomes overwhelmed and unable to effectively process all the gases.
High-flow cats, on the other hand, are designed to allow for greater exhaust flow while still providing adequate emission control. They achieve this by using a less restrictive design, often with larger or more numerous honeycomb cells, which allows for more efficient gas flow. This increased flow can help to reduce backpressure in the exhaust system, improving performance and reducing the buildup of gases that can cause unpleasant smells.
Several car enthusiasts have reported success in reducing exhaust smell by installing high-flow cats. In one instance, a user with a Subaru noted that their car produced a strong odour due to a catless downpipe installed by the previous owner. By replacing it with a high-flow catted downpipe, they were able to significantly reduce the smell while also passing emissions testing. Similarly, another user with a Magnum was able to improve the exhaust smell and meet stricter emissions standards by employing twin high-flow cats as part of a custom exhaust system.
While high-flow cats can help reduce exhaust smell, it is important to note that they may not eliminate it completely. The level of improvement can depend on various factors, such as the specific car model, the type of fuel used, and the design of the exhaust system as a whole. Additionally, it is worth mentioning that high-flow cats can sometimes result in a slightly louder exhaust sound, though the impact may not be significant for some individuals.
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High-flow cats may not change the sound of the car
High-flow catalytic converters, or "cats", are aftermarket modifications that can be made to a car's exhaust system. While there are many reasons to install high-flow cats, one of the most common is to change the sound of the car. However, opinions vary on whether high-flow cats actually increase the sound of a car.
Some people claim that high-flow cats will make a car louder. This is because high-flow cats are less restrictive than stock cats, allowing more sound to pass through the exhaust system. Additionally, long-tube headers can be installed along with high-flow cats, which can further increase the volume of the exhaust tone at wide-open throttle.
On the other hand, others claim that replacing stock cats with high-flow cats may not make a noticeable difference in sound. One person even stated that their car was "barely louder than stock" after installing high-flow cats. It's possible that the change in sound may not be significant enough for some people to notice, especially if they are not specifically listening for it.
It's worth noting that other factors can also affect the sound of a car, such as the type of catback exhaust system installed. Additionally, high-flow cats can help to reduce the drone associated with some exhaust systems, making the car sound smoother and possibly giving the impression that it is not as loud.
In conclusion, while high-flow cats may allow more sound to pass through the exhaust system, the actual increase in volume may not be significant enough for everyone to perceive. The change in sound may also depend on other factors, such as the type of catback exhaust system installed and the presence of other modifications.
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High-flow cats can improve power
High-flow catalytic converters can improve power in certain situations. They are designed to meet or exceed original equipment (OE) quality and performance standards without sacrificing flow rate. This means that they allow for a more efficient flow of exhaust gases, removing restrictions that can impede performance.
If your vehicle has a stock engine with no modifications and relatively new OE catalytic converters, you won't see much of a performance increase by switching to high-flow catalytic converters. However, if your vehicle has an older catalytic converter (8 years or older), or a cheap after-market catalytic converter, upgrading to high-flow catalytic converters can help recover some power lost due to a clogged or inefficient catalytic converter.
Additionally, if your vehicle has a modified engine with significantly more power than stock (a 20% increase or better), upgrading to high-flow catalytic converters will almost certainly result in improved engine power. This is because high-flow catalytic converters can reduce backpressure, which can restrict performance, especially in turbo engines.
While the primary purpose of high-flow catalytic converters is not to improve sound or volume, some people have reported that they can make the exhaust louder, especially at wide-open throttle, while others have found that they help to reduce drone and smoothen out the sound. However, the impact on sound may not be significant, and the results may vary depending on other factors such as the type of headers and pipes used.
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Frequently asked questions
Yes, high-flow cats will increase the sound of your car. However, the increase in sound may not be significant.
The loudness of your car with high-flow cats depends on the type of catback exhaust you have. If you currently have no cats, your sound level is at a 10, adding high-flow cats would drop your sound level down to a 7.5.
Changing to long-tube headers along with the required x-pipe and high-flow cats will make for a louder exhaust tone at wide-open throttle but not change the exhaust tone much during normal driving. However, just replacing the stock cats with aftermarket high-flow cats might not change the sound at all.
Whether your car is too loud with high-flow cats is subjective and depends on your personal preference. Some people may find that their car is too loud with high-flow cats, while others may find it tolerable.
