Built for heat and wear resistance. 911 3.2 1984-1989 Engine M930.20, M930.21, M930.25, M930.26. 911 (964) C2/C4 3.6 1989-1994 (2 required) Engine M64.01, M64.02, M64.03. 911 (993) C2/C4/RS 3.6 & 3.75 1994-1998 (2 required) Engine M64.05, M64.06, M64.20, M64.21, M64.22.
