I own both 2007 G35S (110k miles, modified with PSS10, Eibach swaybars and some chassis braces) and 2017 GSF (500miles, totally stock) . Compare both cars, I think my old G35S still can provide me more steering feel and quicker response than GSF!!! Therefore I think I can buy Q60 400 and put KW V3, Stillen swaybars, some chassis braces on it. I should be able to get similar GT-R feeling on street. It's only on street. On track, I need to consider cooling such as oil cooler, transmission cooler, bigger brake, etc.