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When GT4 started in 2007 the cars were not homologated. Only a technical file existed and the same model done by different tuners could participate (eg Nissan 350Z, Porsche Cayman, Lotus Exige, etc).
Only from 2009 there are homologation files following a homologation regulation and RACB homologated the cars for SRO.
In short, there's no full list with homologation numbers like there is in GT3.
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