Evo air box kit from AF1 - replaces original airbox top with a sleeve that then seals off the airbox using the underside of the fuel tank. Gives much larger capacity to the air box. There are a couple other designs out there too. The kiwis make them themselves!
The restrictor is not really a restrictor. It sits in front of the air intake of the airbox - put there to quieten the induction roar. It comes out easy enough - you just have to lift the tank, unscrew the airbox and pull it up and back from memory. The restrictor slips out of a locating slot (I did it - but not worth the bother IMO, unless you were doing the airbox too).
The flywheel removal is actually weights that are bolted onto the flywheel itself. These weights can be removed resulting in lighter flywheel = quicker throttle response, quicker to gather revs - but the jury is out whether it's actually an "improvement". Some guys like it, others don't. Not job not for the beginner either. Do a search on the RSV forum - there's detailed instructions there.
