944 S2 didn't come out til 1989. Here are all the 944 variants:

1983 to early 1985 944 - M44/02 2.5 liter 8v inline four 150 hp
"1985-1/2" to 1986 944 - M44/07 2.5 liter 8v inline four 150 hp, updated interior and some other stuff
1987 to 1988 944 - M44/09 2.5 liter 8v inline four 158 hp
1989 944 - M44/11 2.7 liter 8v inline four 162 hp
1987 to 1988 944 S - M44/40 2.7 liter 16v inline four 188 hp
1989 to 1991 944 S2 - M44/41 3.0 liter 16v inline four 208 hp
1986 to 1988 944 turbo (a.k.a. 951)- M44/51 2.5 liter 8v turbo inline four 217 hp
1988 944 turbo S / 1989 944 turbo (a.k.a. 952) - M44/52 2.5 liter 8v turbo inline four 247 hp