Lexus is finishing tests on its new high-performance GS F, which according to some sources, may debut as early as this fall at the 2014 LA Auto Show.

Technically, the GS F should go up against the BMW M5 (552hp to 592hp), Mercedes-Benz E63 AMG (550hp to 577hp) and Audi RS6 Avant (552hp).

However, if what we hear about Lexus using a mildly tuned version of the RC F’s new +450hp 5.0-liter atmospheric V8 with close to 500hp is true, then it may be positioned between those cars and the likes of the 450PS (444hp) Audi S6 – at least power-wise.

We expect the Lexus to send those ponies to the rear wheels via an 8-speed automatic, though, we can’t rule out the possibility of an AWD version to help it expand its customer base and compete with the E63 AMG 4MATIC and the S6.

Lexus’ cosmetics package is on the light side with the GS F prototype getting more aggressive front and rear ends, including the “F” sub-brand’s signature stacked exhaust finishers and a discrete boot lid spoiler along with side skirts, and bigger wheels, tires and brakes, but that’s about it.

Photo Credits: CarPix for CarScoops

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