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To enthusiasts, Porsche has always had a distinctive sound and the Cayenne continues this tradition. But the throaty roar is secondary to the optimum performance and reduced emissions the exhaust system has been engineered and tuned to deliver.
The entire exhaust system is made of specially developed stainless steel alloys for strength and durability. Each exhaust manifold uses short-length runners to accelerate catalytic converter warm-up, an essential requirement for more effective emissions control. Both the primary and main catalytic converters employ metallic substrates instead of conventional ceramic design. This technology offers a larger surface area in the catalytic channels, which means the dimensions of each unit can be reduced for more efficient packaging. Other benefits include greater overall efficiency, faster warm-up and longer service life. A pair of Lambda probes inside each of the two primary catalytic converters supplies a real-time analysis of exhaust gas composition. This information can then be used by the engine management system to adjust the air/fuel mixture as required. So effective is this system that the Cayenne V8 meets the stringent U.S. Low Emission Vehicle exhaust emission regulations. The twin exhaust channels from each bank of cylinders are combined in a muffler which then exits through a set of sporty tailpipes. In the end, the audible signature of the Cayenne V8 communicates its awesome pontential in a subtle, yet unmistakable rumble. |