Looking to upgrade my standard front brakes but not looking to pay the 1.2 - 2k for a new set of ap's.

Does anyone know if you can run foc rs calipers on a 4x4 and if so what discs are used.or any other caliper and disc combo that could be used from another car to upgrade from the standard set up. Best places to get brackets and any other parts that would be required.

Cheers