@Loki94 I am installing the same headers this week. Your thread is pretty helpful. From what I understand you removed both cats, installed a single GESi cat, removed the muffler, installed a resonator and still have both your O2 sensors? How did you eliminate the O2 codes?
I was thinking of keeping the downpipe from CXR as is, replacing my crusty old stuck muffler with a Solo Stealth STL 35 (Ottramm used to use these for his stainless kits a few years back) , and adding an O2 bug right before the muffler, but I'm not sure if I could keep the ECU happy or not.
BTW I immediately thought the 4 bolts and gaskets they sent along were garbage as I opened the package too. View attachment 2944814
View attachment 2944817
Are you running sliders? If so, how was fitting the straight pipe in the bottom? Care to share a picture of how the exhaust sits with sliders installed?