Some riders are happy with their brakes just the way they are.
However there's no doubt that the OEM brakes can be improved upon, other than by just choosing different pads or disc rotors. Unfortunately, they only bolt straight on to the later FJ's, that came originally equipped with four pot calipers. Another alternative are AP calipers, as in pic 4. Harrison 'Billet ' Six Pots 2. Ace Calipers on 3CV 3.