Marks left over from the Modulo spoiler. I think it's probably the adhesive since the car isn't old enough for the paint to have faded in different areas right? Either way, with a bit of polishing/buffing, it's not noticeable anymore.
Mugen spoiler is thinner at the base so on both left and right side, it takes up maybe 1/3 of the space which the Modulo took up. That's why it's noticeable where the adhesive marks were originally; but now, with a bit of polish/cleaning, it's not noticeable.
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