Put light fairings on the roll cage and wing support tubes and any similar bits cutting air. A simple tail of folded cardboard and two wraps of hundred-mile-an-hour tape can cut the drag of those parts to a third. Light, well-shaped fiberglass wraps could be much better still. You might even get to laminar flow in clean air, if the vibration isn't too bad.
A thin metal wrap on those headers could give both streamlining and downforce, especially if the pipe angles are adjusted with that in mind.
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