I'm back from Tokyo and a couple more runs there with three different cars.
Two of them were on my stock challenge list, the C7 '14 ( 576 PP ) and the NSX '17 ( 578 PP ). While I was able to at least get in reach of Kokubun and achieve a clean second place podium with the Corvette, the NSX was too slow and I didn't even finish the race.
It's not impossible to win with each of the contenders but you really need a slow grid - or simply be a quicker driver than me.
The Corvette C7 at Tokyo
I finally picked up a Fairlady Z at the UCD and tried @RCKakashi14 's challenge. Really appreciate it !
As mentioned above by @TRB1999 the car is everything but an easy drive and after a few test laps I decided to focus on safety and car control when entering the actual run. Tbh I couldn't have been much faster but it's been more important to finish cleanly ( contact only once when Blaszan rear ended me ) in a run I'm content with.