There already is one, It's as legal as possible and doesn't sound like shit because it vents back into the intake like it's supposed to...

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96 V2 WRX sedan future track car
[COLOR="DarkSlateBlue"]Barbs Short:[/COLOR][COLOR="Red"]DNS[/COLOR]
[COLOR="DarkSlateBlue"]Barbs Long:[/COLOR][COLOR="Red"]DNS[/COLOR]
[COLOR="DarkSlateBlue"]Top Speed:[/COLOR][COLOR="Red"]Depends on how fast I can push it[/COLOR]

05 WRX wagon daily driven