Thanks Pleiades. Then it must be Yamaha South Africa that's enhancing their Tenere's by fitting the DNA filter.
I did not open the filter box of the bike in Aus so can't tell what filter is in there as standard. But I don't like the snorkel and will modify/replace it when I'm there again.
Fortunately I won't be staying too far from Kev and will most likely visit him for some advice and modifications