Has this type of this turbo diagram ever appeared before?
 

Has this type of this turbo diagram ever been done before? It's similar to the usual parallel twin turbo set up except the intake side. It's parallel set up on exhaust side but the intake is series from one turbo to the other. Has anyone ever seen it? What's car model? What are the advantages and disadvantages compared to the usual parallel twin turbo?

This is a variation on a compound twin turbo - you might have to size the exhaust turbines differently, but it's something that typically only makes sense for very high levels of boost, in the 40 psi or greater range.