Ignore how crap it is, Also only one turbo to keep it simple.
So the airflow goes... Airfilter, turbo, intercooler, throttle, inletmanifold, head, cylinder, exhaust manifold, turbo, exhaust pipe.
Obviously on its way out it spins the turbo that then pressurises the air going in.
If people have an interest in diagrams like this I could take the time to draw them properly.