I had one installed in Melbourne by a dealer here for Tunit and he did the install in 5 mins. I have had it set on 8 out of 10 for 4000kms now with less black smoke than before and simply stunning power delivery especially up hills. Best money i have spent on her to date. I believe if you disconnect the battery and press the brake you will reset all computers in the car you then take her out for a quick fang and it will re learn your driving patterns. My next mod will have to be air intake as i think its starving for air under hard accelleration as it occassionally whistles.

Chip it sooner than later but i think the best way is to use a plug n play chip so you can return it to factory setup easily.

Good luck