Nice one mate - welcome. What colour is your GTI? Manual or DSG?
You cant really go wrong with any of the stage 1 tunes for the Mk5 GTI, as all have well and truly been tried and tested and will give you the same results + or - 5% assuming the car is in healthy mechanical condition.
Tarmac Engineering is certainly a place that comes to mind to recommend in the Brisbane area for tuning. Mk5 Golf Gti ECU Tune - Tarmac Engineering
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