I agree with Bob about his comment re: the gearbox. I think that they may be a tad shy about supplying too much overboosting at this time, as I'm sure they are more than aware of the relatively delicate gearbox that they presently have. Given the outragous cost of gearbox repair, the last thing Nissan wants/needs is anymore negative feedback about anything on their vehicles, especially their iconic flagship. To say that the automotive world is watching, would be the understatement of the century! I would expect the ol' midnight oil to be a'burnin' back at H.Q., in an effort to come up with a stronger unit, without breaking the fragile bank of today. Perhaps a more critical look at the metallurgy, before a wholesale replacement of the unit is called for. I'm sure we would all wince at the R&D costs expended thusfar in that area.