So I wonder if this a split turbo or just a disassembled classic turbo, and if this is the front side of a turbine or the front/back side of a compressor... could also be a compressor airbox...
The part looks different from the older Renault turbines/compressors.. their last compressors are usually silver and the turbine is dark metal... and this thing seems to have a single entry/exit (the red capped part on the right of this turbo piece...)
If it's a compressor, its intake (the part that is covered with the big red cylindrical cap) seems to be smaller than the Honda or Merc compressor...