And just as it prepared to unveil the Concept One in production trim, Rimac decided to get even more radical.
At the 2016 Geneva Motor Show, it unveiled a new variant of the Concept One called the Concept S.
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This is the "evil twin" of the Concept One, Rimac says.
Backing that statement up is the Concept S' claimed power output. Because while the Concept One already produces a claimed 1,088 horsepower and 1,180 pound-feet of torque, the Concept S tops it with 1,365 hp and 1,328 lb-ft.
That power is sent to all four wheels via a two-speed, dual-clutch gearbox.
Rimac Concept S
The combination of titanic power and relatively low weight gets the Concept S from 0 to 62 mph in 2.5 seconds, and on to a top speed of 226 mph, Rimac says.
To help the Concept S corner as well as accelerate, Rimac also gave it a more extensive suite of aerodynamic aids, including a front splitter, rear diffuser, and a large rear spoiler.
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All of this increases downforce by 34 percent compared to the previous Concept One, according to Rimac.
The car is powered by an 82-kilowatt-hour lithium-ion battery pack. Rimac did not quote a range figure, but did note that the Concept S is equipped for DC fast charging.
Not that the Concept S is particularly well suited for long journeys.
Rimac Concept S
There is an onboard infotainment system, but it's mostly devoted to harvesting and displaying data from the car's many sensors.
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Rimac did not say whether it plans to put the Concept S into production, but it previously said the somewhat tamer Concept One would sell for $980,000.
For more 2016 Geneva Motor Show coverage, head over to our show news hub.