GS is in the works with a 255 HP turbo 4 banger.
IMO I don't suspect they will make a GNX version to compete with the SHO. From what I've read the regal is meant to compete with the TSX, which has similar dimensions and Drivetrain options.
I suspect Buick will make a (junior) executive rocket ship version of the LaCrosse, to go head to head with the SHO...and steal some luxury buyers from Lexus in the process. my.02
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