Ok, I went to the tint shop today to get my WK2 tinted.
Here is some information for the guy who want to go and do things knowing what to ask for.
The back doors, side windows and back window has from factory a 20% tint. 20% light goes thru. It was measure by the machine in the shop.
The Front doors and windshield have from factory already 4% filter. Meaning that anything you put in those three pieces of glass you will need to compensate by 4% less light goes thru.
I install in my car 35% tint in my front doors and windshield and the machine measure it at a 31 %. To be legal here in Puerto Rico has to be 35% including plain glass filter so I needed to be on 40% tint to end up in 36% tint to pass the local police specifications and get a seal of approval by them. Right now I will be pushing it.
Will have photos of how good it ended looking.