We located a Franklin engine with 6 horizontally opposed cylinders and a turbocharger. The author does not know if it is of origin or if it is an adaptation with Supplementary Type Certificate (STC).

"The above mentioned Franklin engine"

-The turbocharger is clearly at the engine's right side (left of the photo).

-A long intake manifold is situated behind the turbo (Upper Deck) below the cylinders on  the right and jumping over the engine to the cylinders on the left.

-The author does not see the APC or in other words the "Absolute pressure valve" that limits the maximum pressure at the intake manifold (Upper Deck).