The Audi 80 Exhaust Manifold is an exhaust system designed to vent the hot gases from the cylinders, allow the engine bay to breathe, and block fumes that could harm the occupants. The Exhaust Manifold is located at the end of the cylinder head and the exhaust system and collects the spent mixture from each combustion chamber in a single stream, directing it to the catalytic converter, muffler, and tailpipe with the aid of precisely shaped runners that reduce back pressure and eliminate intake reversion. The first series of Audi saloons were based on a massive cast iron Exhaust Manifold, which was sought after due to its longevity and tolerance to frequent expansion and contraction, but it weighed more, and its interior surfaces were not very smooth, thus decreasing the speed of the gases passing through it. With increased engine outputs, subsequent versions of the Audi changed to a smoother stainless steel tubular Exhaust Manifold resembling performance headers and employing equal-length pipes to keep pulse ratio equal and enhance scavenging to sharpen throttle response and reduce emissions. Irrespective of material, all Audi designs have one tube per cylinder, hence a four-cylinder unit has four branches and then converges. Even the strong piece can be broken by heat cycles, and a leak disrupts the air-fuel ratio, robs power, and allows the poisonous gases to be directed into the cabin, so a homeowner needs to be sensitive to any ticking noise or even a burning odor indicative of a malfunction. Classic Audi lovers are concerned with promptness since, through effective steering of the exhaust, the Exhaust Manifold contributes to the quiet, though important, aspect of steadiness of the character that drivers desired in an 80 sedan.
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