This spoiler is FAILED. It is still same gap when it was bolted on.
I'm thinking to get SD wing or something else to find grand prix spoiler on website. I have my car coming soon on Pontiac show at June 22nd. I thought I have everything perfect on plan but spoiler screw me up. I will return it back but I know the paint they won't refund it which it is suck. Maybe I sell it knockoff spoiler and tell lucky silver grand prix it is fit but I decide get SD wing because they are huge than knockoff spoiler.