My mechanic's Camaro has the cowl induction hood.
https://www.octanemotorsports.com/1998-2002-chevy-camaro-4-cowl-induction-fiberglass-heat-extractor-hood-p-3429.html
This is similar to what aerohead did with his T-100 that he ran at Bonneville.
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If a smooth and complete underbody tray with rear diffusers is not too complicated and expensive to have done
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Here's the one I like:
The outer fences run from just inside the rear wheel and tire and curve outward to the outer edge of the rear tire. With a flat roof, you still have a diverging duct. Here are some others. Bombshell Betty of course:
Straight fences. Then there was Lucra (they were burning lucre):
I asked him about that difusser and he said it had been proven out in a wind tunnel. It has four fences but appears to have winglets or something connecting them.
edit;
Then there is this; the first difusser that really impressed me:
That's a lot of fences, but it's on a mid-rear car. They do diverge though.