+1 on what MajorSoftie says. I bought a new '06 from N.Y. and registered it in CA with no problem after locating the hard-to-find sticker. Mine was on the underside of the tank.Yes, they are 50 state legal (as sold at the dealership).
It may need the canister re-installed, depending on the particular Cal DMV agent you deal with. With most, when bringing a bike into California, they will need simply need to see the emissions sticker which Ducati inconveniently put up under the tank.