TOP RX7 MOTOR SECRETS

Early 12A engines also feature a thermal reactor, just like the 0866 10A, plus some use an exhaust port insert to lower exhaust sound. A lean-burn up Model was introduced in 1979 (in Japan) and 1980 (in the united states) which substituted a more-standard catalytic converter for this "afterburner". An important modification on the 12A architecture