I am in the process of replacing the catalytic converter from my 94 YJ 4-cyl because of broken honeycomb chunks clogging the exhaust. I've thought about not having a catalytic converter and having a straight pipe instead. But I decided to have one. Now, Can I replace it with cheaper ones (< $60) with similar inlet/outlet diameter? or do I need to replace it with direct-fit ones? Some of these direct-fit ones are expensive.