Funny I just watched the Top Gear episode from 2011 when they took the updated GTR around the track - watching Jeremy sweep past the Murcielago SV, Enzo and Veyron to park it at 1:17.8 - impressive stuff for a Nissan you can throw a billion miles on just doing oil changes.
It was also featured in Jeremy’s independent film last year. “Powered Up.” Using a high frame rate camera, they demonstrated that it launches faster than the Mclaren MP412C. And using a radar gun they demonstrated that it held high speed corners better than every other car in the film. Ferraris, Porsches, Lambos. And it was killing them. What was a 95mph corner for the others was a 105mph corner for the GTR. Then Jeremy declared that nothing they could take around that corner could beat the Nissan.
So I’m also a little perplexed as to why you’d want to tinker with something that’s already a world beater straight out of the box.