The turbine housing is the housing that covers the turbine. Turbine housing is used to collect exhaust gases from the engine, before funnelling them towards the turbine wheel, so that it can rotate. The turbine housing is one of the most crucial parts of the turbo-charger, to determine how the turbo will peform. Turbine Housing are made from cast iron or a high temperature. Like the compressor housing, it features a “volute”, spiral design to help maximise the speed of the exhaust gases running through it.