An interesting read...

4 GT-Rs tested - all different, though I did read somewhere that they where all hand built, and therefore all produce different power levels - but 40bhp difference...

yeah they said on top gear that each car was unique and that the engine and gearbox will only work in the car its put in originally but id be a little annoyed if my car was less powerful than the next that was sold 40bhp is a lot!