So what are the differences for a 1991 944 turbo compared to earlier cars:

Bridge type rear spoiler

Boge non adjustable black shock absorbers

Design 90  cast wheels, earlier forged  wheel   

Brake pad wear sensors

Blaupunkt Symphony stereo

787 built (ROW only)

1990 1089
1989 1333
1988 917 (Turbo S)