Took off the gloss black high kick performance spoiler from my e92 a week or so after I put it on, because I had a color matched one shipped to me afterwards. No damage from it being on for a week, there are a few minor paint chips from shipping somehow. 2 of them are not noticable at all when installed, one is not noticeable unless you're staring at it from the bottom looking up, less than a foot away.
$160 rs price
Pictures can be found in my ad
BMW E92 M Performance High Kick Trunk Spoiler