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Non turbocharged vehicles can benefit greatly from fitment of extractors. Extractors replace the exhaust manifold on the engine, which is like a common "rail" which direct exhaust gases from each cylinder out a single exhaust pipe connected to the manifold. Extractors have separate pipes for each cylinder, which are often tuned to ensure that there is maximum efficiency in eliminating exhaust gasses from the cylinder head. Some extractor systems are designed in such a way as to create lower pressure near the cylinder head with a venturi effect to actually help draw spent gasses from the cylinder. The effectiveness of extractors can be dependent on their "tuning" with some extractors more effective at relatively lower rev ranges - whilst others are tuned for higher performance and higher revs. Generally however, extractors are most effective in the upper rev ranges.
Extractors are traditionally used on petrol motors however they are also applicable to non-turbocharged vehicles however for my money, the fitment of a turbo to a diesel vehicle would be a more effective performance solution. Due to the higher compression ratio of diesel motors, performance is generally less affected by back pressure in the exhaust manifold, therefore diesels show less of a performance improvement than petrol engines from extractors. A petrol motor with its lower compression ratio is more affected by backpressure in the exhaust manifold.
Larger exhaust, extractors and free flow mufflers also have the added advantage of lowering running temperatures of vehicles due to getting rid of the hot gases faster.

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