The 3.5L is fine as is. If the STOCK redline is now 7500 it means that thing can certainly handle 8000 as well as the current VQ35DE can handle low 7000's. Why wouldn't they turbo it as is if it's so strong? They could simply stuff a TT version of the VQ35HR in the GT-R and call it a day.
And then, five years from now, we'll be talking about swapping those into our S13's
