If your OE CAT is Tired as they do get after a few years ( approx 7 ) or you simply want to replace your OE CAT which are very restrictive in Flow then this is the Answer for you.

METALLIC CORE RACING CAT

Better suited to the High HP cars Utilizing the Metallic core over Ceramic options

Direct Fitment For  NISSAN SILVIA 180SX S13 SSR20DET + R32 SKYLINE R32 GTR RB26DETT + R33 GTS-T  RB25DET

Has 3.0 " flanges with new Bolts and Gaskets and will bolt onto Stock Systems or Aftermarket CAT backs still using the OE factory CAT .

100 CPSI