![]() ![]() #Exhaust manifold fullFor maximum benefit, a full performance exhaust would be necessary when using headers, because great flowing headers are worthless if the pipes after them are overly restrictive. Headers can be tuned to gain more or less performance in certain areas of the engine's power band. They are built with steel tubing, they are often mandrel bent, and most have equal length piping so that each cylinder has similar flow. Headers on the other hand are designed purely for maximum horsepower and torque. Like we mentioned in the "cast iron" section above, exhaust manifolds are often designed with longevity and fitment in mind, not horsepower. An exhaust manifold is an OEM-style part.Īftermarket exhaust manifolds look and fit just like the exhaust manifold that came on the car when it was new, with similar flow characteristics. Many people ask what the difference is between an exhaust manifold and a header. How Exhaust Manifolds Are Different from Headers Unfortunately, like the cast iron exhaust manifolds, tubular steel manifolds crack, too. Many tubular exhaust manifolds also have built in flex-pipes that allow the different areas of the manifold to flex independently with the temperature changes. The steel tubing that the manifolds are constructed with is welded to the cylinder head flange, and at all of the points where the tubing intersects. As you can imagine, mild steel is cheaper to produce, but it won't last as long as a stainless steel exhaust manifold. This style exhaust manifold can be made from mild steel or stainless steel depending on which the car manufacturer preferred. Since tubular steel exhaust manifolds typically have better flow, they are most often found on performance-oriented applications, like sports cars, but there are a few automotive manufacturers out there that prefer using tubular manifolds on non-sport models as well, like Jeep. What Are Tubular Steel Exhaust Manifolds? The same thing will happen if the exhaust manifold gaskets blow out, or the mounting studs break off. Not to mention, all of those toxic exhaust fumes would be able to escape the confines of the manifold and dance their way into the interior of the vehicle. If they crack, the check engine light will pop on, and the vehicle will likely become embarrassingly loud. ![]() Cast iron manifolds are also heavy, and can become brittle with heat cycles and age. That is why cast iron exhaust manifolds are often replaced with more free-flowing tubular designed "headers" when the vehicle's owner is on the hunt for increased horsepower and torque. Maximizing horsepower is rarely a factor. In modern cars, exhaust manifolds are designed to fit into small spaces and live long lives. ![]() That is why so many cars and trucks come with them from the factory. When it comes to the construction of exhaust manifolds, they are either going to be cast iron or welded tubular steel.Ĭast iron exhaust manifolds last a long time and they are cheap to make. Naturally there are exceptions to all of these rules, but in the real world, these exceptions are fairly rare. Rotary engines usually have just one exhaust manifold, though the turbocharged models have "down pipes" on the hot side of the turbo as well. The vast majority of inline engines have just one exhaust manifold. One is for cylinder bank one, and the other is for cylinder bank two. The average V-shaped engine has two exhaust manifolds attached to it. Needless to say, it's pretty important to have an exhaust manifold in good working order. With the help of the exhaust manifold gaskets, it also prevents the toxic exhaust fumes from sneaking into the vehicle and harming the occupants. It connects to each exhaust port on the engine's cylinder head, and it funnels the hot exhaust to the exhaust pipe. A vehicle's exhaust manifold plays the leading role in a car or truck's exhaust system. ![]()
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