Yes.
Legally you can't without getting approval from the NHTSA.
Yes you can but in the event of a serious accident your survival rate goes down.
yes just wont pass inspection
yes
Much better than without them.
You can put Air in Air Shocks Not Air Bags
Indefinitely.
I had '97 that I had to change the pump and bags at six years. Another '97 still has it's OEM pump and bags, my mother-in law drive it now.
You can drive a car without an air intake pipe but it may end up pulling hot air in from the engine compartment. This will reduce the engine's overall performance.
Air bags designed for doing that, not auto air bags. Question was in auto repair.
no