Thanks for this. I just used both of your DIY's to do the side gills and grills.
Grills (which I did on my e92 335i) are still a bit of a pain in the ass, but the gills were pretty painless with this method.
2016 Yas Marina Blue F82 M4 ZCP
2011 Le Mans Blue E92 M3
2010 Le Mans Blue E92 335i