This 10cm, loose turbine housing, is made to go onto your existing DSM black with a 6H turbine wheel. It can only be purchased with external gate off O2. Porting and coating are also available. Additionally, running this housing in a "WG on the O2" configuration will require the turbine housing porting option in order to control boost to pressures below 25psi without boost creep. Porting options can vary depending on your boost targets, feel free to ask questions!