I don't know if you'll actually see anything as we don't really know about the physical changes. As far as I understand these new starter/generators are called Integrated Starter Generators, or ISG's. They are described as large electric motors that act as the starter motor and alternator but can also assist the engine by sending torque through the drive belt to the engine’s crankshaft. The system is also fitted with a small lithium ion battery.
But start/stop engines do already have these as far as I understand....
But start/stop engines do already have these as far as I understand....