Cast turbocharger turbine housing having guide vanes

A turbocharger (1) including a compressor section (3) and a cast turbine section (2), the turbine section (2) comprising

• a turbine wheel (4), and a turbine housing (11) that defines a gas inlet (13), a gas outlet (10), a volute (9) disposed between the gas inlet (13) and the gas outlet (10), and vanes (20) arranged in a plane that protrude integrally from, and have a fixed orientation relative to, two opposed inner surfaces of the turbine housing (11),
• wherein the turbine wheel (4) is disposed in the turbine housing (11) between the volute (9) and the gas outlet (10), and the vanes (20) are disposed in the turbine housing (11) between the turbine wheel (4) and the volute (9), and at least one vane of the vanes (20) has a cross-sectional shape that is different than the cross-sectional shape of at least a different one of the vanes (20).