Fastest I’ve ever been was Northbound on the Yoko-Yoko just south of Yokohama in my friends R32 with a laundry list of mods, tuned by Midori. (Me driving, him - not in the car) Speedo read just under 305kph. I dout I was actually going that fast though (no GPS to conferm), the car dynoed around 520hp at the wheels and with the functional track oriented, (read: actual downforce) body kit there probably wasn’t enough power to hit ~189mph. My guess is around 170mph.
Oh, anyone ever see the Top Gear episode where they proved if you go over ~150mph speed trap cameras can’t capture the car? Well they were right!
(can’t wait to here the flames from this one :shrug: )