PS and NM are two words that are used in the automotive world to define power and speed. Here, PS is a German word which means Pferdestärke -the equivalent of horsepower or Torque, the actual power produced by the engine. And NM stands for Newton Meter which is a unit in SI and is the standard way of expressing the same horsepower produced or torque produced by the engine.
The top speed of the Chiron is limited to 420kmph. Bugatti Chiron is powered by an 8.0-litre quad-turbocharged W16 engine that makes a whopping 1500PS of power and 1600Nm of torque, the Chiron can do the 0-100kmph run in just 2.5 seconds.