Ok here is how you access the air filter in your Tenere Wiggy

Here it is, yeah ok yours is different because it looks like this 

So now you have two choices, you can undo the 4 phillip head screws and take the top and snorkel out. Then pull the snorkel from the lid, clean the filter and fit only the lid minus the snorkel.
Best option is to fit a DNA filter lid from off the road, it is better at clamping the filter when the snorkel is removed in my opinion as the snorkel adds strength to the standard lid.
http://www.off-the-road.de/en/XT-660Z/Stage-2-Airbox-cover-XT-660-Tenere-2008.html
And fit allen head screws 
Here is my filter from the navigation ride, dusty cause I played in the pack

Here is Strucky’s one day I cant remember when :whistle:

There is a thread here worth reading 
http://www.obtrailriders.com/index.php/forum?view=topic&catid=18&id=116440
jtb don’t read this :whistle:
TB
PS I edited the shit from the thread as I just saw its in the Tech thread