LITTLE KNOWN FACTS ABOUT 13B ENGINE FOR SALE.

Early 12A engines also aspect a thermal reactor, similar to the 0866 10A, and some use an exhaust port insert to reduce exhaust sound. A lean-burn Variation was released in 1979 (in Japan) and 1980 (in America) which substituted a far more-common catalytic converter for this "afterburner". A serious modification with the 12A architecture was the 6P