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It had to do with the design of the ram air. In the birds, the ram air is more efficient than the SS because the air enters the "nostrils" on the hood and goes in a straight shot into the air box. since that part of the hood is higher and gives more clearence, they raised the air box to allow it to kinda line up wiht the inlet from the nostrils.
In the SS, the ss hood, has the same clearence as the plain z28 hood up front, theres no room for a raised airbox. In the SS, the air enters the scoop and is then split and diverted to the sides and then up front when it "turns" back around and comes out a small slipt type openeng the width of the airbox opening and only and inch or so in height.
Mainly it all has to do with the hood clearence. Heck, most people i've seen who had the SLP airlid alone on z28 or SSs have rub marks where the lids already meet the hood. Thats one reason ill never buy a slp lid, i like my TSP one.
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