I'd surmise (guess) that the Cayenne calipers woul flow more fluid than the stockers....
Depends on what you have on front -
"Why bother" comes to mind...
Why not go with a proven setup?
930 brakes are fairly related to the 917, but are not the same.
3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ -
"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno