scion   are one of the easiest bolt-on accessories you can use to improve an  performance. The goal of headers is to make it easier for the engine to push exhaust gases out of the When you look at the four-stroke cycle in how car engines work  , you can see that the engine produces all of its power headers xb  during the power stroke. The gasoline in the cylinder burns and expands during this stroke, generating power. The other three strokes are necessary evils required to make the power stroke possible. If these three strokes consume power, they are a drain on the engine.xb headers

In a normal engine, once the exhaust gases exit the cylinder they xb headers  end up in the xb headers  exhaust manifold. In a four-cylinder or eight-cylinder engine, there are four cylinders xb headers  using the same manifold. From the manifold, the exhaust gases flow into one pipe toward the catalytic converter  and the muffler . It turns out that the manifold can xb headers  be an important source of back pressure because exhaust gases from one cylinder build up pressure in the manifold that xb headers affects the next cylinder that uses the manifold.Catalytic converters are amazingly simple devices, so it is incredible to see how big an impact they have. In this article, you will learn which pollutants are produced by an engine and how a xb headers  catalytic converter deals with each of these pollutants to help reduce vehicle emissions.xb headers

• During the exhaust stroke, a good way for an xb headers  engine to lose power xb  is through back pressure. The exhaust valve opens at the beginning of the exhaust stroke, and then the piston pushes the exhaust gases out of the cylinder. If there is any amount of resistance that the piston has to push against to force the exhaust gases out, power is wasted. Using two exhaust valves rather than one improves the flow by making the hole that the exhaust gases travel through larger.