The founder of electric sports car builder Rimac Automobili, Mate Rimac, when not helping create new cars, creates YouTube series about those cars. They include series such as Discover Rimac Today and Mondays with Mate. One of the more intriguing series is the documentary-style look at the C_Two electric supercar‘s ongoing development, and the latest episode shows two C_Two prototypes testing new upgraded suspension and active aerodynamics as part of testing announced back in December

The two vehicles seen sharpening their senses at the Automotodrom Grobnik track outside Rijeka, Croatia, look similar but have significant differences underneath. One has an old suspension setup and no active aerodynamic technology, while the other has an upgraded and improved suspension and Rimac’s full active aero kit. The most noticeable feature of the system is the rear wing that moves up and down. Meanwhile, hearing the cars whir about is fascinating in its own right.

If you’re craving more footage of the C_Two, Rimac has you covered. The EV builder has captured the car’s aerodynamic wind tunnel testing, the crash testing, as well as the computational methods used throughout the process.

When the C_Two finally launches, it will immediately become one of the most advanced vehicles on the market. At its conceptual debut in 2018, Rimac claimed the C_Two would have four electric motors at each wheel and would be powered by a 120-kWh lithium-ion battery pack. In total, the C_Two is said to make 1,888 horsepower and 1,696 lb-ft of torque, and it still claimed 404 miles of range on a single charge (by the New European Driving Cycle standards). The four-digit power pushes the car from zero mph to 60 mph in 1.9 seconds, down a quarter-mile in 9.1 seconds, and all the way up to a 258-mph top speed. Only 150 examples of the car will be produced.