This entire system can be removed without affecting the car's performance or emissions. There is even a service bulletin related to disabling/deleting the air injection system for the Caprice/Roadmaster/ Fleetwood '95-96. If the check valves fail condensation can get into parts and cause a check engine light, and they apparently didn't really need it after all. You can even get a replacement sticker for under the hood. Do a google for more details. I would recommend removing everything and capping the exhaust manifolds, not sure of the exact size plug you will need. Did it on my Caprice and it really cleans up the engine bay, makes it easier to change spark plugs, etc. If in California you might technically need to leave it in place but disabled.
Harry