The turbo manifold supports the turbine and withstands temperatures of up to 900 °C: it is the most heavily stressed component in a turbocharged engine. An unrestricted design builds boost earlier; a suitable flange allows you to install a larger turbocharger than the original one and therefore target a different power level.

The choice of material matters just as much as the design. Cast iron withstands heat cycles without cracking and dampens vibrations. Stainless steel is lighter and allows better designs, but requires properly designed supports: a cantilevered turbocharger will eventually tear open a weld.