We flog a preproduction Regal GS at GM’s Milford Proving Ground. The relaunch—revival, really—of Buick’s storied, then abused, then abandoned GS performance moniker is quickly approaching: The $35,310 Regal GS hits dealers this fall. This fall is soon, so as the car enters its final development phase, GM invited us out to its Milford, Michigan, [...]

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