nsride

I have a 94 hatch that im putting in a b18c5 with a dc jdm 4into1 header. i was thinking of getting a cat back system in 2.5 pipe but i was wondering what to do about a cat what will fit? whats works well? etc... wasnt really going to use one at all just get a conector pipe made but now they have all this new emissions and stuff so i guess i have too use it any suggestions?