It was go-time down in Australia for the Manthey Racing team and the final official outing of the 991.2-generation 911 GT3 R this weekend as the Grello Porsche came home in second place, just 0.9 seconds off the winning Mercedes-AMG GT3. Matt Campbell, Mathieu Jaminet, and Thomas Preining came together to put on a show. The Manthey Racing car spent …
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