Both sides would have to be routed to the turbo or it would run like total crap. You could do that exact thing on a 560 SEC without too many issues but I don't really understand that maze of plumbing going into the intake pipe. On the front side, it looks as if he is running twin BOV's but I can't imagine why. There are connections on the back side of the intake plumbing but the only thing I can think they would be is additional injectors.
If i were to do this type of setup and retain it within the walls of the engine compartment i would put smaller turbos, one on each side, sort of like the suber mercedes race engine of the same vintage but without the drastic wings---see pic below--
A turbo on each bank of cylinders would look nice but there is no room on a V8 in the 126. Even if you managed to fit them, you would not be able to change the plugs with the turbos on the car and you would have to relocate the fuel and AC plumbing to make the needed space. It's just not real practical to mount turbo's on our cars due to the location of the spark-plugs on the heads. If our plugs were accessible from the top, it'd be much more feasable.
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