Disclosed is a compressor housing (66) and method of assembling. The compressor housing (66) may comprise an outer volute (98), a cavity (104), an impeller cover (106), a compressor diffuser (108) and an inner volute (110). The outer volute (98) includes a back wall (96) and a curved casing (116). The back wall (96) may include a receptacle (124) and a first plurality of annular steps (126a). The receptacle (124) configured to receive an alignment pin (136). The cavity (104) is configured to receive the compressor impeller (36) and is at least partially defined by the back wall (96) of the outer volute (98) and the impeller cover (106). The impeller cover (106) is configured to fragment during impact with the compressor impeller (36) during a failure condition of the compressor impeller. The impeller cover (106) is disposed between the inner volute (110) and the cavity (104). The compressor diffuser (108) is disposed between the back wall (96) and the impeller cover (106).