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are there the same wheel clearance issues with the LS400 brake calipers that the supra tt calipers have?
Supra brakes are marginally larger both in caliper thickness and rotor diameter as compared to the LS400 brakes. This requires slightly higher disc clearance with the wheel face and 17" diameter wheels at the least.
LS400 calipers require similar, but slightly smaller, rotor-to-face clearance with the wheel (compared to the TT), but the smaller rotor diameter allows LS400 brakes to clear 16" wheels. With spacers, LS400 brakes would clear stock wheels.