Ah, but its done through a Nissan dealer who will probably sell it on their forecourt when its returned. I exect it to pretty obvious if they take the wheels off...
only 1/2 hr to remove them mate probably less if leave it overnight in st johns
dyno's are not really very accurate, they way they are calibrated, the temp and humidity of the enviroment etc etc too many variables, i've only ever used them on forum days or to diagnose problems