Yea its already possible to remap the r33 ecu.
I had mine done last year in Sydney for the new highflow turbo, fmic, fuel pump, etc.
It only cost me $350. It removes the rev limit, speed limit, etc.
When you plan to do it, you should make sure that you get all your mods done first as then you have to pay another $600 for a retune.
The reason I had to go with it is because I have an auto gear box.