That's exactly right Traktion
I don't know for sure what the power handling capabilities of these parts are, but I am confident that they are well within the power potential of this engine for the forseeable future (not sure about other components of the engine though), assuming that correct engine managements parameter calibration has taken place.
Regarding costings, it depends on where you have the installation done. It will be relatively costly for a firm like ourselves to do it (if you discount the added value of our superior delivery and technical expertise profiles), but some may say that this is money well spent. Alternatively there are plenty of 350Z specialists in the UK that may be able to do it cheaper than us. I will be happy to provide an estimate by PM if needed. Please let me know. Thanks
PS, it is cheaper to have it done before an engine failure (saves the cost of a cylinder block, sump and any other damaged components).