Rumors of an F version for the Lexus GS->ke439 sedan first appeared in 2007. After a while, it seemed that the rumors began to die down and it wasn't until just last year that word began to spread that there may be in fact, an F version of the Lexus GS and that it would receive the same V10 engine as the Lexus LF-A sports car.

Now, it becomes official: Lexus has officially announced the GS-F sedan, which will be launched in 2013, will come with a detuned version of the LFA’s 4.8-litre V10. The next year Lexus will also unveil a new SC model.

For the GS-F, the engine’s capacity will be reduced by around 200cc to 4.6 liters and power to 450bhp, making it the most powerful road-going Japanese saloon ever built. Another novelty for the sedan will be Toyota’s first torque vectoring differential. Similar to the diff used on BMW’s M cars and the likes of the X6 SUV, the ‘torque split unit’ actively apportions drive between the rear wheels to aid handling. In addition to that, a similar system is also expected to be fitted to the new SC.

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