The Evaporative Emission Control System, can I remove that? Do I really need it? I do not live in CA, nor will I ever.
Short answer is yes, you can remove it.
If you unplug the wire, it may cause a check engine light. You might have to do a jumper mod on that wire to trick the ECU into thinking its connected.
You also have to plug the vacuum hose. There's two hoses that go into the EVAP canister. One of them vacuums air. If you remove the EVAP can and do not plug this hose, it will start sucking dirt into your fuel system. This hose is easy to identify. When you disconnect them and fire the bike up, it'll be sucking air.
The second hose is up to you. When I go to the track, I take the evap can off and seal both hoses, but notice more pressure builds up in gas tank. Which may cause negative pressure and may actually start to push fuel out of your overflow (happened on my Triumph). To seal the hoses, I put a screw in them and blue tape them but this is because its only temporary. If it were permanent, I would use the screw and electric tape and would monitor excess fuel pushing out of the overflow hose that runs to the bottom of the bike.
Or just leave the second hose unplugged. In theory, only fumes should be coming from that hose.