Originally posted by Si-R Trickey EF9
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. 
Do you notice a performance difference when you do this?
Have you tried running with the exhaust both on, and off?
Just curious.
Back to the topic at hand. A hollow cat will not sound like shit. Any exhaust you get is going to be pretty loud. There's just no avoiding it really. go with 2.25 mandrel pipping, or 2.5 crushed pipe.