I want to add a resonator to my exhaust and was wondering if I would be able to replace the cat with it? That way I could get more air flow and a better deeper tone. What are some good resonators and can I get them from auto zone? Where would I have to put the o2 sensor from the cat? Lastly, I heard that there are resonators that require no welding. Is this true? Thanks a ton guys.

go to http://www.roadraceengineering.com/exhaustparts.htm they have resonators there for pretty cheap.