On my B16 that is in my 90 hatch, I have a 4-1 DC header with a, I think it is Landspeed.com "race" cat, with 2 1/4 pipping all the way to a "stock" muffler pack.

I lost some power by adding the "stock" muffler welded in the back, but I'd rather be quiet and not attract attention of cops. When I go to the track, I just take my axel-back portion of my exauhst off, and run off of an open exauhst pipe.