Mine is a NA and it has factory plates on the intakes.
Hera is a picture before disassembly. The plate just after the Throttle body is a PVC or EGR port because it was filled with soot and tar.
The rear plate on the Air chamber is where I think the turbo would go? There is a vane valve there to crossover the air intakes at wide open throttle
Notice the Throttle body and air valve are completly coated with emissions tar before I cleaned it all up. This steals horsepower.