175mph (280 km/h) in my Mkiv Supra Turbo (Apu). Sorry no pic/proof, but there's a ~1 mile long 'test road' north of Atlanta with almost no traffic in no robust authorotative monitoring
... distance goes by very fast at that speed, and there's a brisk curve in the road near the end, so I ran out of braking-space (road) long before I ran out of vehicle capability or desire to go even faster.
Fwiw, several 'bpu++++' and apu Mkiv owners have reported max speeds in excess of 190mph (speed limiter
disabled, of course).