Awesome, yes, there is more devices such as ignition distributor w/ advance vacuum, carburetor, air cleaner housing, gas (tank) cap. Gas cap is associated with EVAP system, still be a part of emission controlled device. Ignition distributor still be part of emission controlled device that controls the spark timing in advance/retard based on engine speed and manifold vacuum. Carburetor too. Now I see the oldie vehicles still have gas caps, distributors and carburetors, all of them are part of emission controlled devices. Make sense to you?