My friend has 95 Civic Hatchback with a 98 b18c1. His exhaust is a Team 5zigen Fireball full cat and he was wondering will a GS-R cat converter fit his car since he is running a dummy (fake cat) cat? Or does he need to get a civic cat converter. Oh yeah he has DC sports headers 4-2-1 one piece. Any help....what Cat converter should my friend get and will it fit. Thank you for your help.

Heinz57