Modular exhaust gas assembly

A modular exhaust gas assembly, comprising:

• a turbocharger housing having an exhaust flange and a bearing flange receptacle;
• a plurality of turbine scrolls of different sizes for selective installation into the turbocharger housing in dependence on a power of an engine, each said turbine scroll having an inlet zone;
• a plurality of different bearing flanges;
• and
• a plurality of different exhaust links,
• wherein each of said turbine scrolls is connected to the bearing flange receptacle via a selected one of the plurality of different bearing flanges and to the exhaust flange via a selected one of the plurality of different exhaust links,
• wherein the inlet zone of each said turbine scroll is configured to complement a contour of an outlet zone of a standard manifold so that the turbine scrolls of different sizes are selectively connectable via their inlet zone to the manifold to suit the engine power at hand.