B202 & B212
In 1984, Saab added a 16 valve cylinder head with double overhead camshafts. They retroactively renamed the 8-valve version the B201 and used B202 as the name of the new multi-valve unit. Another notable addition to the B202 was hydraulic valve lifters and Ecopower ("ep" in Italy, "(900)S" elsewhere), with a pre-heated catalytic converter for reduced emissions.
In 1991, Saab introduced a 140 bhp 2.1 litre normally aspirated 16 valve engine, with an increased displacement of (2119 cc/129 in³). The intake manifold was enlarged and redesigned for better and greater flow. The intake manifold and the head from the 2.1 liter constitute a well-known replacement for 1985-1993 16 valve 2.0 liter turbo cars. Power increase is modest at stock boost but becomes much more evident at higher boost levels.
Read more about this topic: Saab H Engine