Mercedes-Benz AMG GT spawns track car limited to 55 units

If you thought the GT Black Series would remain the most hardcore version of Mercedes-Benz AMG’s GT sports car, then you’d be wrong. AMG on Wednesday unveiled the even more extreme GT Track Series, limited to just 55 cars in celebration of this year’s 55th anniversary of the Affalterbach tuner’s founding. Its arrival also likely marks the end of…