Holdup

I recomend goodridge lines in race set up (2front both from master cyclinder down to calipers and 1 rear) as said stainless fittins (although i was tight and went with zinc)

OEM disks should be fine and if your pads have plenty of meat on them, leave them be, or upgrade to something like EBC HH sintered (which i have on the front of my k3) and EBC disks (maybe they do an equivalent to go with the pads idk)

Also a caliper overhaul maybe a good idea, new seals (new pistons f you want or just clean up the current ones) and a good clean up in side the cyclinders, check slider slining freely (done mine on sunday tbh i havent noticed to much of a difference but i do have less lever travel now and i found out my LH caliper slider had siezed!)

Suspension im sure other people will recommend stuff but ive just been reading guides on how to set up the preload properly and tbh ive noticed a bit of a difference.