The Nio EP9 is an electric supercar that was first introduced in 2016 by Chinese electric vehicle manufacturer Nio. Here is a review of the 2017 model:Performance:The Nio EP9 is an impressive performer with a top speed of 313 km/h (194 mph) and acceleration from 0-100 km/h (0-62 mph) in just 2.7 seconds. It is powered by four electric motors, one for each wheel, that produce a combined output of 1,341 horsepower. The EP9 also features advanced aerodynamics and a lightweight carbon fiber chassis, which contribute to its impressive performance.Design:The EP9 has a futuristic design with sleek lines and a low-slung profile. Its aerodynamic design is evident from the large rear wing and the numerous air vents on the body. The car also features gull-wing doors, which add to its exotic appeal. The interior is spartan and race-inspired, with a minimalist dashboard and racing seats.Features:The Nio EP9 is equipped with advanced technology such as active suspension, active aerodynamics, and a torque vectoring system. The car also features a complex cooling system to keep the batteries and motors at optimal temperature. The EP9 also has a sophisticated data logging system that records telemetry data for analysis.Availability:The Nio EP9 was produced in limited quantities, with only six units being made initially. The company later announced that it would produce ten more units for a total of 16. The EP9 was priced at around $1.5 million, making it one of the most expensive production cars in the world.Overall, the Nio EP9 is an impressive achievement in electric vehicle technology and a true halo car for the Nio brand. While it may not be practical for everyday use, it showcases what is possible with electric powertrains and advanced engineering.