What is interesting is that Mercedes came up with the split turbocharger only in the first race - in preseason winter testing, they were running a more traditional turbo charger.
Now that we've seen the split turbocharger with the turbine at the back, the compressor at the front and the motor-generator unit in between on top of the engine block it seems all too obvious. But coming up with this is ingenious, and making it work on such short notice is quite a feat of engineering.
I can't wait to have this in my road car, 40% fuel saving with only a little drop in performance.