JDM MAZDA ENGINE - AN OVERVIEW

Early 12A engines also characteristic a thermal reactor, just like the 0866 10A, plus some use an exhaust port insert to reduce exhaust noise. A lean-burn up version was introduced in 1979 (in Japan) and 1980 (in the united states) which substituted a more-traditional catalytic converter for this "afterburner". An important modification of the 12A