Not sure where you got the idea that an FMIC is one of the cheapest mods or one of the ones that are required for BPU. Simplest Supra mods are FCD, exhaust, decat, restrictor ring, spark plugs and fuel pump which are all required to be at BPU safely, boosting 1.2bar as you said, and all these also apply to the Aristo which will see identical power gains. If an identical Supra went up against an Aristo, the Supra would win as it is substantially lighter, but I wouldn't say it would be a complete whitewash.