It’s a relatively simple concept, but one that has proven its worth over the years, enabling the engineers to extract even more power out of the engines. This way, when the cars are running at operating temperatures, the exhaust only has to pass through the main converter, not the pre-cat. The company’s unique system utilises bypass valves to direct exhaust gases to the pre-cat when cold, and to the main catalytic converter when warm. This is where Koenigsegg’s ‘Rocket’ catalytic converter turns this exhaust problem into a performance advantage. This poses an issue where, with most conventional exhaust systems, the pre-cat remains in place even after the main cat is warm and becomes operational, creating an unnecessary redundancy. The first, commonly known as the pre-cat, works when the engine is cold and when the main catalytic converter isn’t up to efficient operating temperatures. Most vehicles nowadays would have two catalytic converters installed. Catalytic converters are an efficient solution in curbing emissions in modern vehicles, but they come with a pretty significant downside: Back-pressure.
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