Sep 5, 2014, 10:26am ET

Lexus developing GS F with close to 500 hp?

Sedan to borrow 5.0-liter V8 from RC F, report claims.

Lexus is reportedly developing a more powerful GS model, known as the GS F, that could serve as a Japanese rival to the BMW M5.

The sedan is expected to borrow the RC F's 5.0-liter V8 engine, tuned to produce nearly 500 horsepower and almost 400 lb-ft of torque, unnamed sources have told Autocar.

The power is said to be delivered to the rear wheels via an eight-speed transmission and Torsen differential, likely push the car to 60 mph from a standstill in approximately 4.5 seconds.

The company is also allegedly working on a different four-door sports coupe that is based on the RC F, simply adding two doors without any overt styling changes. A convertible has also been mentioned as an eventual addition.

The GS F is expected to arrive on the market late in 2015.