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i'd think the taped on spoiler (and body kit for that matter) would be developed in the wind tunnel. the VLN race cars have the front and side skirt installed (no rear spoiler as GT wing is fitted and no rear lower skirt to clear the straight exhaust).
other stuff like sway bars, brake pads, chassis braces etc should have some R&D involved.
with these JDM "tuners", there will be performance parts as well as accessories. dress up your ride the way you want. each to their own.
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