I wondered about this too, I know a r33 which was modded to 270rwkw at 120,000ks and then 300rwkw at about 175,000ks, now has done about 235,000ks and still going strong, it's taken a ruthless beating! road car(he's an idiot on the road!) with track days, and poor maintenance! Another drift track only with 300 for about 5 years and now 340 still going strong, both have good tunes as we keep hearing for good reason, mine's at 300rwkw now and will probably stay under 320 and will be going for track days, will leave the std motor and see how goes!haha
Cheers