There were several "mixes" of engines.
They used to run the Mitsu V6 4.0liters, some the turbo 2.0 from the Lancer EVO.
There was a Mercedes ML with a Toyota Diesel engine.
The new Mitsubishi from the Petrobras-Mitsubishi team definately sounds V8 (it raced in Morrocco). Which V8 does Mitsu has?