Nice car, Boosted_N54.
Comparing dyno results between the US and Australia can be problematic. It all depends on the specific dyno but the popular US Dynojet tends to deliver results that are significantly higher (15 to 20+%) compared to the Dyno Dynamics and Mainline units that are popular in Australia.
The topic is discussed here by well known High Peformance Academy automotive technical and tuning guru, Andre Simon:
https://www.hpacademy.com/forum/off-...d-to-aus-et-al