OEM Issues
Alright, I own a 2004 Chevy trailblazer 4x4 4200 I6. I had a clogged cat and instead of dropping the 600+ on replacing it I straight piped it. Now that dang CEL keeps coming on :hissy: Now i replaced the O2 sensor as a precautionary for further problems and used the nonfouler set up to keep the...