I bought a 2004 Blazer, used, a few months ago. I bought it knowing theres a huge hole in my catalytic converter, with every intention of straight piping this babe. Any way to cut the caty out and weld pipe section in only? Or would i need to replace everything after the caty? Unsure would to do and whats gonna keep my babe on the road so all input is welcome! Please help?

 

OBD2 system was designed to check for presence of a working catalytic converter. Without a catalytic converter you will be setting codes and the SES light will come on.