Itīs def the RS6-engine. With some mods it would produce honest +1000hp. Thing is the gearbox and not the least the cooling.
MTM RS6-R MY09 Suzuka Grey
LP570-4 Performante MY11 Balloon White
The air is collected in one manifold anyway. The reason for two intercoolers is to keep it away from the radiator. FMICs are not very effecient. I remember HGP build a VR6 BiTurbo with a FMIC at a customers request, and the car kept overheating when a magazine tested it on a track.
It's probably a water cooled intercooler. It wouldn't be painted if it wasn't.
The second photograph shows airducts running from the sideblade.
Mazda MX-5 (Miata NB)