I'm running both on different NUs right now. First and foremost listen to Jack re: the scooter kit (good call Jack). If youre still thinking Athena (corrent one), a few things to consider:
This is a moderatly high RPM alum kit. If youre running thru stock iron ones, theres a good chance you may inadvertantly fry this one.
VM18 rocks. Get some assorted jets around the 130 range. Will also need an intake and filter (or stack).
Its possible to use the stock head; a custom will serve you better as the bore is very different. You will need a base spacer.
Finally, maybe I missed it, but you'll want to swap out the stock exhaust for an expantion chamber; even a cheap one will be Ok (not great mind you, but better).