You would have to tear engine down and change rods and pistons. The amg rods are good for 400 hp but base mercedes rods will not hold. Base engines have too high of compression to add boost, and if you are tearing down the engine you might as well punch through the alusil coating and bore to a 3.5-3.7 and run forged pistons on the steel sleeves, do not resleeve this motor, the m112 block is cast around the sleeves which helps strengthen the block. Twin front mounted turbos are doable if that was all we had to do, there would be several already done. But if you could find a wizard that could tune the car when you where done with the motor, there would be several XFIRES shipped to him for the tune.