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The Mitsubishi 4G63 engine can typically handle boost levels ranging from 15 to 20 PSI on stock internals, depending on the specific setup and condition of the engine. With upgraded components like forged pistons, stronger rods, and improved cooling, it can safely handle higher boost levels, often exceeding 25 PSI. However, tuning and supporting modifications are crucial to ensure reliability and performance at higher boost levels. Always consult with a professional for optimal results based on your specific configuration.

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6mo ago

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