New GT series, Our Best Selling Buick Turbo The GT6152 is a revolution in Buick Turbo technology. It replaces many of the old turbos we used to sell. Why replace them you ask? Because this turbo spools faster, hits harder and needs less stall speed than the others. If you don't mind putting in a torque converter (call for recommendations), this is a good choice and can push the car into the 10's