Quote from: jdeprato on July 15, 2013, 07:19:45 AM
My LMS downpipes threw a code until I had Torrie turn off the rear O2s. I posted about it in one of the other forums. I think the cats they used are the ones they use on their long tube headers from other cars, but as 4DR points out they are not the correct efficiency, etc... to keep the O2 sensors from detecting a problem and they throw a code. Since we only get visually inspected for cats where I am I only had to worry about them actually being there, they don't actually have to work in terms of keeping the O2 sensors from throwing codes. With the other V8 vehicles I've owned with long tube headers it has always been my experience that the tuners would turn off the rear O2s.