Quote Originally Posted by tom91ita View Post
per the GCR it does not say "shall" but "may"
Tom, I think you're cherry-picking. Copying from your quote above, here are the important bits:

...The spoiler/air dam shall be mounted to the body...On cars with integrated bumpers, the front spoiler or airdam may be attached to the bumper cover.
Bottom line, nothing in there allows attachment of the airdam to anything other than the body or the integrated bumper cover.

is that the "body" or the "bumper" as noted below?
Integrated bumpers are included in the "outline" and vertical viewing. - GA