There are 3 tabs on the front grill you have to basically cut off in order to remove it from the grill. Then, re apply it with 3M automotive adhesive tape.
I had to go through this with my GT grille swap. Have to break tabs off to get it off. I went the 3M route, but I filled it with epoxy to have a flat surface. She's not coming off.
I was wondering if I was going to have to break tabs off. I'll probably go with the epoxy fill as well. however I might use velcro to reattach. That way I can set check them out, at will.