Is this a two door or four door ?
The main thing I see that stands out to me is the rounded trunk/boot.
An easy fix for that is to simply add a trip strip where the airflow would begin to tumble.
Your biggest gains will most likely come from adding a Kamm-back, and perhaps other mods like wheel gap fillers/smooth wheel covers, and a front spoiler or undertray cover.
Personally, I would do a Kamm-back before i did the wheel skirts.
Regarding the bumper holes, yes that would help some, but most likely not enough to show. It's easy to do, and would help - just not that much.
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