Hi there, Is it possible to change Mac-05A with Mac-11B with some modifications. Mac-05A was used with KG engine, which is K-Jetronic without O2 sensor, instead KE-Jetronic with O2 on MC engines. Regards, Chris '85 Audi 200 2.1Ti FWD - some ignition problems '85 Audi Coupe Quattro 2.2i - a lot of body work....