From there, turbocharged EJ Subarus have an uppipe. Since the focus of this piece compares headers vs downpipes, and we know from our “ Different Types of Downpipes Explained” post that downpipes are specific to turbocharged vehicles, the remainder of our comparison will be limited to turbocharged vehicles.Īs we follow the flow of the exhaust out of the cylinder head, it travels into the header. Despite which unit your vehicle is equipped with, the function is the same. Vehicles equipped with a turbocharger(s) have headers or a turbo manifold. With inline engine configurations the header is more condensed as it only collects from one side. On the boxer engine, especially for Subaru, most headers will come as a single unit even though it collects from different cylinder heads. For V configurations, there are usually two sets of headers that join later in the exhaust system. On engine configurations with two cylinder heads, like a wide V (LS v8 engines) or horizontally opposed (boxer engines like in a Subaru or Porsche) the header collects from two different places. Its job is to evacuate exhaust gasses exiting the exhaust valve from the cylinder head and into the exhaust system.
What is a header and what is its purpose? HeaderĪ header is the portion of the exhaust system that attaches directly to the head or heads. One part of the exhaust system not covered was the header. We’ve previously touched on the different components of the exhaust system with our “ Cat-Back, Turboback, Axle-Back: A Comprehensive Guide” post.
FAR MANAGER HEADERS UPGRADE
An upgraded downpipe or header can accomplish increased flow but, which upgrade provides the most power gains? Let’s talk downpipes vs headers. This is typically why exhaust modifications are so popular. Most enthusiasts know that increasing exhaust flow can help increase horsepower.
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