For the first 4000km I never had a problem with surging, and quite honestly had no clue what all the discussion was about on this site...

Now, slowly I am starting to notice the problem... although right now it doesn't bother me too much. I have the feeling the backfiring when slowing down has increased a bit is aswell.

I am going to go through a few of the steps you guys are all suggesting, and have already started off with taking out the snorkel yesterday. For the moment the only difference I noticed was a deeper sound when accelerating. I suppose the snorkel really mainly helps to dampen the sound.

Will see what other modification bring.