I run a Tommaselli twin pull on my bike with some 36mm Dells off a Ducati, friend of mine made up some new head inlet stubs as the head is 36mm ID on the R90 heads.
I was running a K and N filter in the stock position, then no filters now 60 mm bellmouths.
Next its fit my new programmable ignition.
Bevel Heaven does the throttle, Dells,bellmouths etc, Steve is good to deal with. I have been unable to find better pricing on them.
Love you bike and the vid...well cool.