What does performance headers do

To avoid the cracking issue, exhaust manifolds typically have to be made with thicker walls than the headers. This shrinks the space gases can travel through.

Combine that with the compact size, and you get something of an exhaust bottleneck. Which means, over time, less horsepower and torque.

Exhaust headers, though, with their longer individual tubes, are designed to prevent this. But does that play out in real life? Donut Media tried to find out using an NA Miata. So, what's the difference between an exhaust manifold and header, and which one is the best choice for your automobile? Typically made of cast-iron, exhaust manifolds are typically included in factory cars and trucks.

They are inexpensive, relatively easy to install, and are capable of withstanding the high heat and pressure associated with exhaust gases. However, there are a few downsides associated with their use, including the potential for cracking. Cast-iron, although cheap, isn't the strongest material on the planet.

Similar to an exhaust header, exhaust systems can be replaced with their performance versions — which have wider diameter. Thus, reducing pressure and allowing exhaust gases to travel and leave quickly. When exhaust gases leave quickly, it means more room for air to enter the combustion chamber. This allows for bigger combustion and thus, extra horsepower.

Performance aside, performance exhausts also come with performance mufflers — which are designed to make louder and aggressive noise. So does this mean performance exhaust gives you extra horsepower and louder sound?

Yes sir! Before we move on to the comparison between header and exhaust, I want to talk a bit on the different types of exhaust systems. There are 3 of them:.

In this article, I will only compare catback exhaust with the header. Catback exhaust is the most popular choice among enthusiasts.

They provide the best bang for your buck — some horsepower improvement and great sound. More detailed explanation below. The price will differ depending on your car and the brand. More reputable brands will obviously be more expensive but they are not always the best! You need to do plenty of research on forums, articles and YouTube videos to find the best.

For example, when looking for an exhaust, you need to pay attention to the piping diameter, sound, material and warranty. Aftermarket header can provide more horsepower horsepower than a catback exhaust horsepower — especially when tuned.

This is because stock headers manifolds are usually much more restrictive and they are closer to the combustion chamber. If you care only for horsepower, then headers are hands-down the better choice than a catback exhaust. Headers will not provide much sound improvement — although you will have a slightly louder engine sound. This happens because aftermarket headers that are made from stainless steel are thinner — allowing sound vibrations to escape outside. I cover more about exhaust headers and sound improvement in this article.

Catback exhaust on the other hand will definitely provide sound improvement — loudness depends on the type you buy. This is because catback exhausts come with aftermarket mufflers as well — the component responsible for your car sound. The good thing about exhaust is that you are free to choose how your car sounds. Just make sure you research the sound on forums and YouTube videos before purchasing. Some exhausts are extremely loud while others are aggressive — yet tolerable.

They are aggressive but not deafening to the passengers. Mobile Newsletter banner close. Mobile Newsletter chat close. Mobile Newsletter chat dots. Mobile Newsletter chat avatar. Mobile Newsletter chat subscribe. Under the Hood. Engine Performance. How do exhaust headers work to improve engine performance? Updated: Feb 11, See more car engine pictures.