A busfriend did some wrenching in the enginebay of my Surfbus:
There wasn't enough space to fit the oldskool/okrassa-style airfilters. This is because of the fact that i have the "doghouse"-coolhousing. I'm going to make some tubes wich wil fit on the carbs and on the airfilters. I will make them just long enough to fit along the coolinghouse. And then i'll post a photo of it. I don't like the modern airfilters wich are on it now!