I went with the SACCC 4 Piston Front and Bake Kit and Rotor upgrade. It was a major job due to having to remove the rear uprights for the rotor upgrade.
If you are using your factory rotors, then I would think the install would be easy. I don't know the details on the 6-piston setup but guessing the rears would be similar to the kit I used.
Scott was good with tech support and I recommend calling him directly for fastest service.
My system works well but I changed everything including the brake MC and had the booster rebuilt as well.
John