Previous and current owners thrash the shit out of them.
The RB26 is an indestructible / bullet proof engine... With the right type of maintenance and correct way of using the RB26.
Just to name a few, the stock front mount intercooler, blow off valve and air box can handle 300+ kW's easy.
It is widely known for its strength and extreme power potential and it is not uncommon for 600 hp (447.42 kW's, approx) to be achieved without modification of the engine internals.
- http://en.wikipedia.org/wiki/RB26DETT#RB26DETT
The gearbox was one of the strongest gearboxes to come from a factory, from memory it can handle 500kW's, the clutch is a different story. That is R32 and R33 GTR.
The Getrag 6 speed for the R34 GTR is fine for 300+ kW's.
Parts will cost more than a non high performance car, although they are widely available.
High performance vehicle = No such thing as fuel efficient.
Buy a Toyota if you want to save money on fuel.
A R34 GTR is between the age from 7 to 10 years old (As production started between 1999 to 2002) and things will need replacing after so long.
Brake pads are cheap, I bought a set of R32 GTR Nissan pads for about $120.
R34 GTR won't be that much more and you don't have to buy Nissan / Brembo ones, DBA, Bendix etc make pads for GTR's.
Brake rotors, if it is just for normal street driving, DBA can match a set for the R34 GTR or go see Brembo.
You mean the HICAS? - (High Capacity Actively Controlled Suspension)
If your mechanic knows what they are doing, it is not hard to disconnect, if not, just leave it.
It is use at high speeds when turning corners, from memory, if you are driving over 80km/h and turn a corner or entering a bend, the rear wheels will turn 1 degree on the opposite direction.
Quite a lot of Skyline owners dislike the HICAS.
Myself, I have got use to it.