Exhaust Manifold

• An exhaust manifold evenly distributes the combustion mixture -- comprised of a specifically calculated ratio of air and fuel -- into each intake port of the cylinder head of the engine. Exhaust manifolds also serve as a mount for engine components such as the fuel injectors and carburetor.
  
  

Headpipes

• Exhaust extractors, also referred to as headers, are a series of exhaust headpipes that attach to each cylinder. The pipes then converge into a tube-like device called a collector. Exhaust extractors are typically composed of stainless steel or ceramic.
  
  

Function

• Exhaust extractors increase engine performance by reducing the back pressure, which results in a more efficient delivery of combustion mixture and therefore a higher power output by the engine. Back pressure is the resistance to fluid via bends or obstructions within an enclosed area. Pressure is added by piping and vents circulating air against the direction of the flow.