Clay,
You forgot another important difference:
S calipers brake better than stock calipers.
P.S. By the way, this is a fact that was proven true, by the seat of the pants method, on one tired old 914. It is not the result of scientific analysis of a statistically significant sample using double-blind testing methods. As a result, YMMV.
P.P.S. This qualifier may molify Curt Curtis and his rant in another post
Michel Richard
914 2.2E six MFI