Just did mine and your post saved me time and $$$. At 1st look under the hood of my 550i I was like oh shyt gotta let the dealers do it but then looked on the forum here and found your thread and DIY. Excellent! 20 mins later and a gentle tug with pressure from an auto trim tool on the rear and both grilles are out and the new ones installed. I went with carbon fiber sport grilles I got from Modbargins. Looks really great! Thanks man.
'15 F80 M3 sedan (Sapphire Black Mettalic) - Mine #1
'14 Cayman S (Agate Gray) - Mine #2
'13 Harley Davidson Dyna Custom - born to ride