Posted this on a different thread, but then stumbled on this discussion and wanted to contribute some real field experience…
I used a full Ft+Rear Racing Brake (RB) BBK on my 2018 Raptor (Massive Fr 400mm w/ 6pot calipers / R 390mm w/4pot calipers) under 20" Vorsteiner VR wheels). ROCK SOLID! Ran these for over 100k miles (actually, 110kmiles on original pads and rotors), with absolutely NO issues. I wish Ford built engines as bulletproof as these brakes! Provided needed stopping confidence, LONG noise-free wear, and better pedal feel (with full SS brake lines) vs. mushy OEM. Ran these brakes in a lot of different environments, including up and down local mountain roads/switchbacks, towing a 7klb boat, and a lot of highway miles. I would HIGHLY recommend… IMHO RB builds solid kit (period).
Selling the Raptor, and purchased a 2023 Lunar Edition TRX (15kmi). I am now investigating a brake upgrade compatible w/ OEM 18" beadlocks with 37x12.5 Nitto tires. RB offers what I expect to be some solid options, including a full front setup, but only rear rotors and pads (Ram EPB issue). Understand its physics, and there is only so much gain you can expect with these smaller rotor/caliper or even rotor/pad-only kits under an 18” wheel vs. a full BBK with 20”+ wheel, but definitely talking with Warren and RB again, as the performance and high build quality of their product is proven in my mind.