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Detroit Auto Show: Hummer H3R Concept, Opel Corsa OPC Join Maroon 5 on Stage at GM Style

Looks like the General's bringing the big guns out at their "GM Style" pre-Detroit Auto Show party. That's right, they'll be bringing the "racing inspired" Hummer H3R concept — that's the LS7 7.0-liter V8-powered concept first seen at the SEMA show in October — and the Opel Corsa OPC hot-hatch right up on stage at the…