this is what our GTR mechanic told me:
-modify your R35GTR, even an air filter upgrade, warranty void and cant get serviced at the dealership
-if one rotor has a hairline crack, all rotors plus pads to be replaced
-if one tyre punctured, all tyres have to be replaced and they cost over 1000 a tyre(GTR tyres are made only by BRIDGESTONE and DUNLOP)
-turn VDC off, warranty void cuz its a SAFETY(wtf) thing
-apparently a jap spec GTR cant be serviced at dealerships cuz its different to the aussie delivered ones
services are pretty damn regular and even though some can afford it, going back to the dealership several times is going to annoy owners cuz your servicing the car more than you drive it and in the end, some might be thinking they would rather have the older model GTRs and modify them plus the older GTRs are easier and cheaper to maintain or just buy something else
the mechanic also drove them during their training course(a prerequisite for GTR technicians) and while he said they are quick, he felt that the technologies have taken the controls away from the driver and feels unnatural (our GTR mechanic races cars before) and he said its annoying how when you go round the corner with all the VDC, traction steer, etc on, you'll see a variety of lights and warning signals blinking all over the place telling you are going round the corner too fast so we are doing this, doing that blah blah blah yada yada yada trying to work out some kind of compromise.