IMO, and thanks to Sentinel for pointing me to this thread, there are some fundemental weaknesses in the 3.0R that would need to be addressed:
1. Radiator - standard is 16mm and only just manages with the standard power config
2. Head gaskets - I popped one in the right hand bank between cylinders at around 150,000 kms and they are a known weakness. There are good aftermarket gasket kits from the USA which are much stronger than standard (and much cheaper than OEM).
3. Exhaust system - Headers, hiflow cat and 2.5 inch all the way from headers to mufflers.
4. Auto Transmission - Not rated above 350Nm of Torque, and this mod would see around 436Nm. I would suggest a used tranny refurbished and strengthened if such a thing can be done. The standard tranny can get hot quickly when doing spirited driving if you do not have an oil cooler.
Now I am by no means experienced in the automotive field as many of you, but I would be extremely dubious of bolt on kits without proper attendance to all issues around power and torque gains of this magnitude.
Then, if you are still ready to make it go faster, you will also need to consider making it stop. And so the dollars just keep going up. To do this type of mod reliably, I would suggest a budget somewhere nearer to 12K plus any tuning and ECU mods and dyno time. Might bring it al together for 15K if you don't run into problems (like insurance and rego).
BTW, I assume you would take the Intercooler version.
So, this should attract some responses, and all responses welcome. Don't be too harsh on me though, I am a novice!