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The "Choof, Choof" sound that a car makes is from an HKS Super Sequential Blow-Off Valve. This is like a safety feature that release pressure when letting off the gas pedal, it's the same any BOV (I think). The difference is that, it has 2 valve, one for low pressure and high pressure, causing the dual "Choof" sound.
If you have the Drift Bible, you can hear it from the white S14.
Here's a link to the description on the product.
http://www.hksusa.com/products/more.asp?id=792
If you have the Drift Bible, you can hear it from the white S14.
Here's a link to the description on the product.
http://www.hksusa.com/products/more.asp?id=792
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