When it comes to corrosion, stainless steel is the best choice to avoid this problem. Since stainless steel does not rust, it will usually turn blue near the flanges if it experiences high temperatures. On the other hand, the quality of the pipe alloy has a significant impact on the life of the headers and its efficiency. Therefore, Engine Arts only uses high-quality stainless steel pipes from YC Taiwan.
Headers, by replacing the factory exhaust pipe of the car, increase the speed of the exhaust gases. In the cast iron pipes on cars, the main goal of automobile companies is to occupy less space under the engine and lower the production cost. While in the production of headers, its efficiency is of primary importance. With fluid analysis and also optimizing the path of movement of the exhaust gases, a quality header is produced that can increase the power of the engine. In well-designed headers, they create an effect called scavenging effect. When the exhaust gas moves through the header pipe towards the collector, a negative pressure wave is produced that returns from the header pipe towards the exhaust port when the cylinders overlap. This negative pressure helps to discharge whatever exhaust gas remains inside the pipe and also helps to charge the air entering the cylinder.
The cost of producing headers is high. On the other hand, most automakers try to minimize production costs in their high-volume cars. Therefore, it is not common for the company itself to use headers on the car. Of course, most of the companies' luxury cars are all equipped with headers and sports exhaust systems.
Depending on the type of vehicle, there are different types of headers. Long headers are more expensive, difficult to install, and take up more space. However, due to their high sweeping effect, they are suitable for cars with tuning equipment and can perform very well at high engine speeds. Short headers also produce a sweeping effect and are easy to install depending on the engine structure. Just as the long type was suitable for high engine speeds, the short type improves exhaust gas velocity at low speeds. And its positive effect can be seen on any factory engine without any changes to the engine.
Unfortunately, there are many manufacturers on the market who do not have any specific knowledge about the behavior of fluids and car engines and see headers as just a few pipes connected together. In fact, improper design can cause flow back into the cylinder and damage the engine.