Blowoff valves, of course, make that "pssh, pssh" sound we often associate with over-turboed sport compacts with eighteen-deck rear wings and obscene amounts of torque steer. But, if you've got a sunroof and a pal with a shotgun to ride shotgun, they can also turn your vehicle into an effective mobile wild turkey or duck blind in urban environments. We imagine that's what these guys were working on, anyway. [Thanks to Michael for the tip]

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