Spy photos show a 6-Series 4-door coupe model that will compete against the likes of the Audi A7 Sportback.

Here is another set of spy shots of the upcoming 2013 BMW 6-Series Gran Coupe with the M-Sport Package doing some testing on the Nürburgring.

We've previously reported on the details of this upcoming 4-door coupe from BMW, which will compete head-on with the Audi A7 Sportback and the Mercedes-Benz CLS.

But we'll give you the recap:

The Gran Coupe will be based on the 5-Series and will share the same wheelbase length as that model but will be longer than the Mercedes CLS-Class. It will come with frameless door-windows but will have a B-pillar. 

Under the hood we expect a 300 hp (224 kW / 304 PS) 3.0-liter six-cylinder, a 400 hp (298 kW / 406 PS) 4.4-liter V8, a 3.0-liter turbo-diesel with 204 hp (152 kW / 207 PS), a 3.0-liter turbo-diesel with 245 hp (183 kW, 248 PS), a hybridized 3.0-liter petrol with a 54 hp (40 kW / 55 PS) electric motor, and a twin-turbo V8 with 555 hp (408 kW / 563 PS) to 570 hp (425 kW / 578 PS).

The 2013 BMW 6-Series Gran Coupe will make it to dealer showrooms sometime in late 2012.

Gallery: 2013 BMW 6-Series 4-door GranCoupe with M-Sport Package spied on Nürburgring