What is the Header?

[RemingtonDella]

Header exhaust, also known as the exhaust header, serves as the initial stage of the exhaust system. It connects to the engine via the "exhaust manifold" (commonly referred to as "banana" in Chinese). A four-cylinder engine typically has four exhaust manifolds. The primary function of the header is to merge these four exhaust manifolds from the engine's cylinders into a single pipe. Additionally, the header houses a catalytic converter. Common causes of white smoke from the exhaust pipe include: 1. Water in the fuel, or engine coolant leaking into the cylinders due to a damaged cylinder head gasket, cracked cylinder liner, or cylinder head. 2. Severe wear on the camshaft of a particular cylinder's fuel injection pump, causing delayed injection timing and incomplete combustion of diesel, resulting in white smoke. 3. Poor fuel injector atomization or the presence of multiple washers beneath the injector. When replacing injectors, ensure to remove any copper washers inside. 4. Leakage in a water-cooled intercooler, allowing coolant to enter the cylinders through the intake manifold. 5. Faulty turbocharger turbine-side seal ring, allowing engine oil to leak directly into the exhaust pipe, forming "white smoke." If white smoke is severe and other components appear normal, thoroughly inspect the turbocharger for oil leaks. 6. Extremely low ambient temperatures making it difficult for the cylinders to warm up, especially noticeable as white smoke during cold starts in the morning. This typically transitions to blue smoke as the engine warms and eventually becomes colorless, which is normal and should not be mistaken for a fault. 7. If the engine suddenly loses power while driving accompanied by heavy white smoke, this is usually caused by excessively delayed fuel injection timing.

[Lonnie]

The header is the starting section of a car's exhaust system, directly connected to the engine's exhaust manifold. It refers to the pipe segment linking the engine to the catalytic converter or muffler. Since childhood, I've been passionate about car modifications and discovered that headers significantly impact performance. A well-designed header—featuring smooth piping and minimal internal backpressure—allows exhaust gases to exit swiftly, improving engine breathing, throttle response, and quicker RPM buildup. In racing or performance cars, stainless steel or larger-diameter headers are common upgrades for horsepower gains. However, caution is needed as modifications may increase noise or violate emission regulations. During routine checks, I inspect headers for rust or cracks, which can cause exhaust leaks and trigger the engine warning light. Always include header inspections in regular maintenance to ensure weld integrity and material durability. Upgrading headers is a great entry-level mod, but emission-related components must comply with local laws to avoid legal issues.

[Rogers]

With years of experience in car repair, I often encounter issues with the exhaust header. It's essentially the frontmost section of the exhaust pipe, connecting the engine to the catalytic converter. If the header develops cracks or rusts through, exhaust leaks occur, producing a loud tractor-like rumble and reduced engine performance. During inspection, you need to get under the car to visually examine it—don't wait until the catalytic converter fails, as that's more expensive to fix. Replacing a header typically costs a few hundred dollars but is time-consuming due to tight spaces requiring specialized tools. Older cars have simpler headers, while modern vehicles with added sensors make the job more challenging. I recommend annual exhaust system checks, especially in rainy areas where headers corrode easily. Address problems early to prevent chain reactions affecting other components. OEM parts offer peace of mind, while aftermarket modifications require extra caution.

[WalkerLynn]

The header in a car refers to the front section of the exhaust system, which connects to the engine outlet. From an environmental perspective, this section is crucial for emission control. Most headers nowadays come with built-in catalytic converters to reduce carbon monoxide and hydrocarbon emissions into the air. If the header becomes clogged, aged, or damaged, the vehicle may fail tailpipe emissions tests and consume more fuel. Regular maintenance is essential to prevent impacts or corrosion and extend its lifespan. When replacing the header, choose compliant products to support green driving.

[RichardRose]

I enjoy DIY car modifications in my spare time, and the exhaust header is a relatively easy project to start with. It's the front section of the exhaust pipe. Make sure the engine is cool before removing the old one to avoid burns. Use a wrench to loosen the nuts, remove the cracked or rusted old section, then install the new header in the correct position and tighten it securely. The key is to prevent leaks, otherwise the exhaust backpressure will increase and the engine will feel sluggish. Beginners are recommended to use standard parts first, and having all the tools ready makes the job easier. After the modification, you'll notice a significant change in sound - if it's too loud, consider adding a muffler to tone it down. While DIY is fun, safety comes first, and don't overlook legal regulations.