as most of you know im running a b16a (stock) setup, in a 91 civic dx, as far as exaust i dont want it to be loud, but i dont want to loose any performance, right now as it sits i am running header and lower manifold up till the cat conv, where it is chopped off, as far as a new converter im not wanting to hollow it out because it will sound like crap, where can i get a rather new cat. converter for this motor?

i didnt use the stock dx one because i have tried and tried to get some rusted bolts off but its impossible to do, so i have to go get another one