[6] The Agera ceased production in July 2018 with the unveiling of the two final edition cars at the 2018 Goodwood Festival of Speed.

[9] The total weight of the engine is only 197 kg (434 lb) due to a carbon fibre inlet manifold and aluminium construction.

The chassis is also made out of carbon fibre with an aluminium honeycomb structure that comes with integrated fuel tanks for optimal weight distribution and safety.

The rear wing is electronically adjustable with auto setting or manual control in order to have as little compromise as possible between low drag and downforce, depending on driving conditions.

[13] The Agera comes with forged aluminum wheels with centre locking nuts, measuring 19-inch on the front and 20-inch on the rear and wrapped in a set of Michelin Super Sport tyres that can be used for speeds of up to 420 km/h (260 mph).

[14] The Agera R made its debut at the March 2011 Geneva Motor Show with a Speed Racer livery, and special Michelin tyres.

The Agera R has a drag coefficient of Cd=0.37, or Cd=0.33 at high speed due to its adaptive rear wing, while producing 300 kg (660 lb) of downforce at 250 km/h (155 mph).

Furthermore, the pylons holding the wing play not only a role in the Agera R's aerodynamic performance, but also assist in extracting hot air from the engine bay.

[15][16] The braking performance required to maintain this record is enabled in part by the Agera's stability, demonstrated by Koenigsegg test driver and drivetrain technician Robert Serwanski, who was recorded by passenger Rob Ferretti (founder of the group "Super Speeders") braking from 300 km/h to 0 without holding the steering wheel.

[17] The Agera R can produce lateral cornering forces of 1.60 G,[18] due to a combination of mechanical balance and high levels of grip from the specially developed Michelin Supersport tyres.

Upgrades included carbon fibre wheels, enhanced aerodynamics, and engine upgrades allowing the Agera R's twin-turbo V8 engine to have a power output of 1,140 PS (1,124 hp; 838 kW) at 7,100 rpm and 1,200 N⋅m (885 lb⋅ft) of torque at 4,100 rpm on E85 biofuel.

[20] In 2013, one Agera S was the 100th Koenigsegg ever produced, celebrated by a specially-built car with gold leaf inlays named "Hundra" (Swedish for "one hundred").

Thor features a custom two-tone black paintwork consisting of crushed diamonds and white accents.

The exterior features a large rear wing reminiscent of that found on the Agera XS, and a different set of front canards, along with a large front splitter and a Le Mans-style central fin for improved downforce, setting it apart from the rest of the Agera models.

Väder features the same crushed diamond paintwork with a bare carbon fibre centre along with white accents, incorporating the same rear wing as Thor but excludes the central fin.

The potential replacement was shown to prospective buyers via VR in an event held in Australia by the company beforehand.