320mm rotors and calipers from S40/V50T5 AWD & LS-LV Focus ST are a great improvement over the 280 and 302mm 850 and x70 brakes.
The calipers are inexpensive and there isnt much to do to get them fitted.
Here's the 320mm rotor vs the 280mm -
Attachment 26469
Rotor fitted (requires centrebore to be enlarged to 68mm) -
Attachment 26470
Caliper fitted -
Attachment 26471
Test fitting with the adaptor (before coating). Please ignore mismatched fasteners. -
Attachment 26472
Wheel clearance with a Titan -
Attachment 26473