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You mean the sound of the BPV (By Pass Valve), or BOV (Blow Off Valve)? This effect can be done several ways. Cheapest, easiest, safest way is to do the "snorkus/snorkel" removal and put a drop in filter in the stock box. You can also change out the stock airbox for either a CAI or SRI. You could also take of the stock BPV and replace with sometype of BOV. This can result in idle issues, rich conditions, and other not so great things for your car. This effect can also happen after upgrading your exhaust and turbo.
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Joshua
"2007 WRX-20G- Tim Bailey tuned 326 HP 319 ft/lbs
Stage 2 2005 WRX
Cobbtuning.com"
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