Focus Fanatics - View Single Post - popcorn sound on deacceleration
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Old 01-22-2013, 06:42 PM   #4
Continuous
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Join Date: Apr 2011
Fan#: 84970
Location: Pottsville, PA
What I Drive: 2004 SVT ZX3 Infra-Red

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Basically the reason that they back fire like this is because of the compression ratio and that they use a higher octane fuel. Basically takes more to burn so therefore when it does combust during a downshift you here it cause the engine isn't masked as much by the sound of the exhaust leaving the car.
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Infra-Red SVT ZX3
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