I run the 6 piston fronts and 4 piston rears. The rims MUST be 18 or larger ( rims like CR kAIs) must be atleast 19s for clearance. They are pretty powerful brakes I must say. I've had them for 3 seasons but only used them this past summer. I use H6 carbon pads and drilled/slotted 2 pc rotors (355mm/330mm) and rotora stainless lines. They were direct fitment other than cutting the brake dust shields off with a zip disc grinder (rather than taking everything apart) and I had to enlarge on of the bolt holds on the stainless line anchors up 2 sizes. It took me a few hours to install with my brother who is a computer guy (useless with hand tools lol). The cost was over $4000USD but was well worth it. Rotora has MANY colors to choose from but with my black car, red was the answer for me. They have yellow, purple, baby blue, chrome, list goes on.
If I remember right, I lost about 9 pounds on each side in the rear and 10 on each side in the front compared to stock. I use Motul DOT5.1 brake fluid. OEM brake master cylinder and most likely getting rid of ABS due to being able to lock up the wheels at 160km/hr and the ABS not caring or doing anything about it. I want to go with an N1 Brake master cylinder but I can't find a supplier or seller for it.
