A turbocharger product comprising: a turbine housing comprising a body constructed and arranged to house a turbine wheel ; an inlet passage connected to the body constructed and arranged to direct fluid flow into the body to drive the turbine wheel ; an outlet passage connected to the body constructed and arranged to direct fluid flow out of the turbine housing ; and a wastegate passage extending between the inlet passage and the outlet passage ; a diffuser positioned within the outlet passage , wherein the diffuser is constructed and arranged to define a first flow passage and a second flow passage , wherein the first flow passage is defined by an inner surface of the outlet passage and an outer surface of the diffuser and the second flow passage is defined by an inner surface of the diffuser ; wherein the first flow passage is constructed and arranged to accept fluid flow from the wastegate passage and the second flow passage is constructed and arranged to accept fluid flow from the turbine wheel to minimize turbulence; and wherein the diffuser is attached to the turbine housing , and the attachment between the diffuser and the turbine housing is constructed and arranged to allow for variances in thermal growth between the diffuser and the turbine housing , wherein a first end of the diffuser includes one or more radial lips which extend outward from the outer surface of the diffuser ; characterised in that an inner surface of the outlet passage includes one or more radial grooves ; and wherein the one or more radial lips snap into the one or more radial grooves to lock the diffuser into place. a turbine housing comprising a body constructed and arranged to house a turbine wheel ; an inlet passage connected to the body constructed and arranged to direct fluid flow into the body to drive the turbine wheel ; an outlet passage connected to the body constructed and arranged to direct fluid flow out of the turbine housing ; and a wastegate passage extending between the inlet passage and the outlet passage ; a diffuser positioned within the outlet passage , wherein the diffuser is constructed and arranged to define a first flow passage and a second flow passage , wherein the first flow passage is defined by an inner surface of the outlet passage and an outer surface of the diffuser and the second flow passage is defined by an inner surface of the diffuser ; wherein the first flow passage is constructed and arranged to accept fluid flow from the wastegate passage and the second flow passage is constructed and arranged to accept fluid flow from the turbine wheel to minimize turbulence; and wherein the diffuser is attached to the turbine housing , and the attachment between the diffuser and the turbine housing is constructed and arranged to allow for variances in thermal growth between the diffuser and the turbine housing , wherein a first end of the diffuser includes one or more radial lips which extend outward from the outer surface of the diffuser ; characterised in that an inner surface of the outlet passage includes one or more radial grooves ; and wherein the one or more radial lips snap into the one or more radial grooves to lock the diffuser into place. <EOS>