The Exhaust Manifold of the Volkswagen Jetta occupies the high point of the exhaust system, and its primary responsibility is to collect the hot fumes exiting the individual cylinders and hurry them to the catalytic converter whilst preventing the occupants from inhaling dangerous fumes. The manifold is bolted directly onto the engine block and contains a gasket to stop leakage; the number of separate runners is the same as the number of cylinders in the engine. A four-cylinder Volkswagen sedan has four tubes whereas a sporty VR6 has six. With hot gas escaping the pistons, the pressure pulse flows through the runners, and the rush evacuation prevents backpressure, preventing the intake reversion as seen in the absence of the evacuation, which would have consumed power and mileage. There are two broad designs of Volkswagen models over the years, one being heavy cast iron, which is valued because of its durability, and the other being made of stainless steel tubular, which is lighter and accelerates the gas velocity a little more, improving throttle response. Cracks that are formed by this heat cycle may disrupt the air-fuel ratio, depriving the engine of smooth acceleration and letting foul carbon monoxide escape into the cabin, despite the material applied in making the Exhaust Manifold, and thousands of times this expansion and contraction must take place. By then, a quick replacement of the Exhaust Manifold will resume normal flow and continue to maintain the emissions equipment, such as the catalytic converter and the muffler, in their proper operation. Since all Volkswagen have the same underlying principle of gas routing, a modern Jetta still relies on a close, heat-free manifold to direct the exhaust to its maximum efficiency and maintain balance between performance and passenger safety.
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