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Looking like some exotic ram-air system, the missing scoops reveal an elaborate system of vents. Alas, it isn't about performance, it's an emissions thing. The Rover's fussy SU sidedraft carbs were emissions calibrated and required inlet air at 100 degrees F. The middle scoop fed air to an exhaust-heated stove to assure the required minimum temperature. The outer scoops were for summer only, to make sure the heated air wasn't too hot. Owners had to juggle these wacky summer and winter block-off plates. Weird, huh?