Koenigsegg has unveiled its latest, and most extreme version of the Agera and Agera R models at the Geneva motor show. The 2013 model has received a number of upgrades, said to give the R a Veyron-beating 273mph top speed.
Among the most interesting upgrades being the company's latest 'Aircore' wheels - a hollow, one-piece carbon fibre design - said to reduce 20kg from the un-sprung weight of the car.
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Other new technology includes nano-surfaced cylinder liners, which reduce fuel consumption, and help to protect the engine from heat build up at high speed. Koenigsegg has also changed the Agera's engine management system to new and improved in-house system, raising the rev-limit from 7250 to 7500rpm at the same time.
Power is up to 960bhp (from 940bhp) for the standard Agera, and an incredible 1140bhp (from 1115bhp) for the R when running on E85 bio ethanol fuel.
It's not all about power though - in a new deal with Swedish suspension manufacturer Öhlins Racing - all R model Koenigseggs will be fitted with the Triplex suspension system as standard. An improved diffuser adds up to 20kg more downforce above 150mph, and to keep it all in check is the, now-standard, Koenigsegg Electronic Stability system.