A.I.R. - second air induction reaction is a after combustion emission systems first used in Calif in1966.
SAir reduced emissions approx 90 percent
Air is supplied by Saginaw design belt or elect driven pump. In 1980 a pulse SAIR system using tubing and check valves added to the exhaust manifold used the negative pressure pulse to draw air into the manifold.
A.I.R system dosen't effect engine performance . You can remove it if you can pass your local emission police.