The Koenigsegg CCX has them.
Wheels / Brakes
The optional ceramic 382 mm front discs are coupled to 8 - piston callipers and in the rear the 362 mm size is retained with 6 piston callipers. The optional industry first carbon fibre wheels save another 3 kg per wheel compared to the already lightweight magnesium wheels that come as standard. The ceramic discs save another 2 kg per wheel, giving the Koenigsegg CCX lower unsprung weight than any other super car.