Contour Enthusiasts Group Archives Forums General Troubleshooting Bucking / Hesitation and now farting?

I still have to do the O2 sensor tests but I am thinking I have to replace the main cat. Can anyone give any advice on this? Does the new cat just bolt on inline in the exaust or is there cutting and welding involved? I just want to know what I'm getting myself into. Thanks!

BTW: '98 Contour V6 DOHC