I know it doesn't look as good, but the stock breather on these cars is hard to beat in terms of efficiency and not sucking up hot under hood air. Put a K&N filter in it and make sure the plastic end pieces that go to the fenders are in good shape. Put a plug over the openings on the bottom of each side where the heat risers went, and remove the vacuum tube from the flap on each side and then take the flap out completely on each side and you're good to go.
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