I can see this was done on matty sprys dyno and his is known to read from 15rwkw less than "other" dyno's, anyone can make it read 200kw but he doesnt, and he also is just a full time tuner not a designated fitting workshop
Pulled it out on my 1990 180sx and it was still the original, lol, was totally covered in shit, dont think you will be able to get this in aus unless you know sum1 in nissan, i personally wouldnt worry about it...