From GM authority:

Haven't seen this posted yet. Looks like there's more than meets the eye to the rear spoiler. More details here:
http://gmauthority.com/blog/2018/09/...ler-in-detail/
Haven't seen this posted yet. Looks like there's more than meets the eye to the rear spoiler. More details here:
http://gmauthority.com/blog/2018/09/...ler-in-detail/
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