Found this http://www.20v-sauger-tuning.de/ (luftmassenmessertuning)very interesting.
Unfortunately i had no 8,6mm drill so i made mine 8.5mm, i took 16% and made it 53,1mm.
I did not try it on the car yet, will ithe engine go run lean or will it be the same beqause proportion is still 16%?

Oké, the LMM needs some cleaning on the outside, when its done i'm gonna try it.

Reason i asked about the lean running is that i had my doubt about it beqause its the same proportion, 8mm to 50mm is 16% and 8.5 to 53,1 also.
Does the car not "know" how much air is coming in?