Not that I'm aware of. Lucky enough the shop I've been dealing with for all my mods have done it on half a dozen cars, so they weren't experimenting on my car.
Try to search
DIY Guides and/or Post a question on
Cosmetic Modifications (exterior/interior) hope this helps
I'll certainly keep you in mind for M3 style skirts. My preference would be to sell locally since shipping can be a killer on this item from Canada to US.