Used in conjunction with 1.7 in. (43 mm) & 3 in. (76 mm) exhaust risers & CLOSED COOLING. Fits:. 2002 and newer MCM V-8 (305, 350 & 377 cid) MPI engines (s/n 0M615000 and up). MIE V-8 (350 & 377 cid) MPI engines (s/n 0M390000 and up)