2011 Buick Regal GS Study: Videos and Live Photos from Detroit - Film Shows V6 Turbo, GM Says 4-Cylinder Turbo...

Even though General Motors used the term 'show car' to describe the sporty Buick Regal GS that made its world debut in Detroit, there's nothing conceptual about this model. The GS version of the new 2011 Regal sedan that's due to go on sale this summer is said to be identical to the Opel Insignia OPC in all but one element: the engine.

According to GM, whereas the OPC gets a 2.8-liter twin-scroll turbocharged with 325HP, the all-wheel drive GS is fitted with a tuned up version of the Regal CXL's 2.0-liter turbo four that makes 255HP.

However, if you pay attention to the second promotional video after the jump (pause at 52 seconds into the film), you'll see that the GS features a V6 Turbo...

We don't know if anyone popped up the hood on the Regal GS showcar in Detroit to see if it's fitted with a four-pot or a V6 Turbo, but the best explanation we can give is that GM's team took the OPC, added Buick's logos and waterfall grille along with a pair of bonnet air-vents leaving the Opel's hardware intact.

It remains to be seen whether or not GM will offer a production version of the Regal GS in the States, and if so, if it will be powered by a four-cylinder or a V6 turbo engine. Till then, watch the two videos after the break or click here to read more details about Buick's sporty saloon proposal.

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Buick Previews Official Sketch of Premium Compact Sedan [With Video]

During Buick's Los Angeles Auto Show press conference for the unveiling of the Opel Insignia-based 2011 Regal saloon, the company's product marketing director, Craig Bierly, showed a teaser sketch of the next addition to the Buick range, a premium compact sedan.

"And now, I have more exciting news to share with you; the first public showing of a rendering that includes our entire future sedan portfolio," Bierly said at the presentation.

"In addition to the new Regal, which you see on your right, you see our LaCrosse in the center and at the far left, an all-new premium compact sedan with the styling and craftsmanship of Enclave and LaCrosse plus the European-inspired driving dynamics of the Regal - and at a price that will make this Buick our new entry point to the brand.

"Is Buick's transformation complete? No … but we believe we're making steady progress," Bierly added.

While Bierly did not give out any specific details on the car, it's safe to assume that, like the Chinese market 2011 Buick Excelle hatchback, the four-door saloon will also be based on the new Opel Astra (sedan version), which shares the same Delta II platform with the new Chevrolet Cruze.

Our spies have already captured Buick's compact sedan testing in Germany, though at the time, it wasn't clear if GM was developing the car exclusively for China or also for the North American market.

In the States, the new Buick compact sedan will most likely be offered with a similar engine range to the Cruze including a 1.4-liter turbocharged four-pot, and quite possibly, the Astra's more powerful 1.6-liter turbo unit with 180 ponies.

Video: 2010 Buick LaCrosse in the Flesh

Redesigned from the ground up, the 2010 LaCrosse is Buick's latest proposal in the near-luxury segment with rivals such as the Lexus ES350 and the Chrysler 300. The all-new LaCrosse that will make its premiere at the 2009 Detroit auto show will go on sale in the States this summer offered with the choice of two direct injection V6 engines and the option of all-wheel drive. Click here for more details and photos or follow the jump to check out the video.