Is the Buick Regal GS the most important “maybe” of the 2010 Detroit Auto Show? It’s been more than two decades since performance enthusiasts cared about Buick in any meaningful way. The car at that time was the now legendary Buick GNX. Even if the proposed Regal GS makes production... 

There’s an odd bit of historical deja vu at work here. Back in the late ’60s and early ’70s, General Motors wanted to shift a few sporty-ish four-cylinder models from its Opel division into America, so they turned to their Buick dealers. This didn’t work out exactly as planned... 

Meet the Opel Insignia OPC Sports Tourer. Salient facts: 325-horsepower turbocharged 2.8-liter V6, AWD, six-speed manual, eLSD torque vectoring and it’s a station wagon. Oh, and get this — it’s built from off the shelf GM parts. Incoming search terms:Opel Insignia opcInsignia...