because to fit supra brakes requires modifications.
to fit much larger LS400 aluminum 4 pot calipers requires the same amount of modification, but more braking effort can be applied for the same brake imput given :)
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UH?? What modifications need doing? The supra UK discs and calipers bolt straight onto the GS. Is the IS and LS different to the GS brakewise then? Will these LS ali brakes go straight onto the GS? If so what do they cost for a set of calipers, rotors and pads?