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Several dyno runs by Miata owners have concluded that a normally aspirated Miata does not benefit from an aftermarket muffler in any way, other than to provide a more aggressive sound. Because of the Miata's low power, it was optimized as much as possible at the factory.

Several owners have purchased aftermarket intakes, headers and exhausts (this combination typically costs $700-1000), and yielded a total additional horsepower of 3-10hp.

Most noticeable gains are typically from replacing an old cat that has become fouled with age.

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