Nice. Brady showed up at Goodwood with an Akrapovic and it was by far the best sounding GT-R there.
Wait, he's spent $100k *not* including purchase price? And he's not over 600bhp? That's a decat, downpipes, exhaust and Cobb ($5k at most).
Again...$150,000k on mods alone? Something is wrong there. Even if I went on a trolley spree at Endless, stopped off at Amuse and then took a GT-R in for the Alpha 10 treatment at AMS (1100 bhp with the sort of streetabilty your friend has lost), I'd come home with change. I'm including Magnalium wheels, MONO-6 brakes, Recaro ASM X's and the full ESTA kit.
He should post some pictures, I'm sure NAGTROC and GTROC readers would love to see what has to be one of the worlds most expensively modified GT-R's.