Well i dont understand your Point ....
Each Engine is hand made : which is good cuz special attention to details is given and One craftsman hand-assembles the entire engine. Also it's assembled in a Clean room unlike other performance Engines .
Gear Box : why would some one want to run a GTR transmission on some other engine ? i mean like why .. it was just created to be mated with this particular engine. also if by any chance one blows his transmission you can get another one from Nissan and they are tune it to you engine ... Simple
Nitrous oxide is tyres : My dear friend its NITROGEN in tyres and not Nitrous Oxide ... and its has been tested and proved that tyres inflated with nitrogen perform better in Harsh and pressure conditions ...
For the price its available its a GREAT value for money ... Why not we all just research about the Aftersales issues of Lambo's and Ferrari s .. we would know the real value of GTR then 