i am 1 of those blokes, i was the 3rd owner. my mate had it for 6yrs.
had 80,000 genuine kms (aussie log books & service history)!
but then i twinkled with the engine lol, forged bottom end, hks gtrs turbos, cams, clutch etc etc etc & it made 365awkw.
its like having a genuine ford falcon gt then pulling out the engine & making it into a monster - nothing beats factory condition for enthusiasts & resale
what i can say though is that the silver gtr paid for my house deposit, sold it for 40k about 4-5yrs ago (im still in touch with the new owner, just in case )