ANSWERS: 4
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A muffler alone can not reduce the noise of the exhaust gas that is came out from engine, so many vehicle includes the resonator, it functions as a mini muffler, it's placed either before or after the main muffler system. It consists of straight pipe with a sound muffling materials.
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The purpose of a resonator is to reduce the sound of the air intake
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That luvly engine wail at high 'R's! ;-)
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It uses specific geometries to delay sound waves in order to cancel out exhaust sound waves.
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