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Old 08-24-2022, 11:36 PM   #5 (permalink)
Ecky
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Join Date: Dec 2011
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ND Miata - '15 Mazda MX-5 Special Package
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Honda started water-cooling their exhaust manifolds in 1999 with the Insight. The purpose was not to improve economy by any interaction with the gases, but the packaging allowed the catalyst to be placed right at the exhaust outlet on the engine, and the engine got up to operating temperature far more quickly.

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