Nothing to do with the manual but why not just run the Jap car as is (with race rally plates) in Targa instead of paying bulk cash or your time to convert it all over into a Aus shell?

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221.7KW-ATW 498.5NM MMS ROLLER DYNO & BUILT BY STi NINJAS, BUILD #318/600

EBISU SUBARU, SHIBUYA-KU TOKYO