WATCH: Rimac C_Two shows off its active aero

Rimac has already proven that its all-new C_Two hypercar can indulge in long, smokey drifts, and now it's time for the battery-powered Bugatti rival to demonstrate its advanced active aero.

Releasing a short video of the Rimac C_Two in final aero shakedown, the Croatian car-maker says the pure-electric Lotus Evija fighter's wind-bending aids have taken two years of testing to optimise the body and spoilers' performance and efficiency.

As well as actual physical testing with full-size prototypes, the team of engineers developing the new Rimac C_Two says thousands of virtual simulations have been carried out, with final validation after the wind tunnel taking place in the real world on the road and track.

In the new video, Rimac shows off the C_Two's new active rear spoiler that appears to have an air brake function as well as high- and low-drag fixed heights.

Engineers developing the active aero say that the biggest challenge was balancing the car's efficiency with cooling performance that varies radically when either cruising on a highway or burning around a track.

To help maximise downforce when needed and minimise drag to extend the cruising range, the Rimac C_Two has a moveable front splitter and underbody flaps, plus that huge rear wing.

Thanks to the extensive testing, since the beginning of development of the C_Two its aerodynamic performance has improved by 34 per cent.

No drag coefficient numbers have been revealed, but the Rimac C_Two is expected to be one of the slipperiest cars ever made.

Sharing absolutely nothing with the original Concept_One, the C_Two comes equipped with a 120kWh lithium manganese nickel battery pack offering a range of more than 640km.

Better still, the new battery tech enables it to be charged up to 80 per cent in just 30 minutes.

Featuring an electric motor for each wheel, total power is an epic 1428kW while maximum torque is a monstrous 2300Nm.

That's enough to give the upcoming Tesla Roadster a real run for its money, with Rimac claiming a 0-100km/h sprint of just 1.85 seconds and a 415km/h top speed.

Ensuring as much of its might is deployed to a road's surface is new traction-enhancing Rimac All Wheel Torque Vectoring software and, if you're bored of straight-line performance, there's a drift mode for going very sideways very quickly.

Other new tech set for the Rimac C_Two include facial recognition door locks, Level 4 autonomous cruise control and a driving coach that guides you around the world's most famous racetracks.

There's no word yet on how expensive the C_Two will be, but a healthy premium over the Concept_One's already towering $1.6 million (before taxes) is expected.

Rimac says it plans to make 150 examples of the C_Two.