Make and model?
1. The 'spoiler' you specify won't do much. An example that would get you the most ROI with a fiberglass cap might be the Golf GT-W12-650:

Generous ducts on three sides. Else something with better access?
2. A study on the effect of exhaust position on drag and lift (08-29-2024) -- Logic
3. This will benefit from a full bellypan. Start the divergent angle as far forward as possible. A proper diffuser has strakes and fences -- an extreme example.
Make and model?
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Necessity is the mother of invention, but simplicity is it's favorite aunt --Amish proverb
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