Nissan Skyline RB20DET RB25DET T3 Flange Top Mount Manifold will fit RB20/RB25DET 6 CYL ENGINES RB20DET, GREAT FOR SWAP: S-13/14 1989 - 1999 MODELS - T3 Turbo Flange SUS321 stainless steel - Fully TIG welded - Fully Ported and Polished fitment: RB20DET - R31 Skyline R32 Skyline GTS-t 1989-1992 R32 Skyline, Laurel, and Cefiro 1993 on Skyline GTS-25t in Japan Includes bolts and gaskets Professional Installation Recommended