I have recently installed a Vance & Hines Super Radius Exhaust system on my 2016 Street Glide, and have been getting trouble codes from my FP3 saying both front & rear are running rich, and also throwing both front & rear O2 sensors are running lean. The FP3 gives a brief explanation of what the codes mean (don't have the exact codes right now I can check again later i needed) could be a possible exhaust leak at the ports. I replaced the gaskets when I first installed the header with new Stock tapered gaskets, but was getting these error codes, so I bought the Vance & Hines gaskets which are not tapered, and seem to fit the header better than the tapered ones did, but I'm still getting these same rich & lean codes. I have dbl. and triple checked my torque values for the header both when hot and when cold, and they are spot on, I even set them per my service manual with partial torque on one, then partial on both, then fully torque the first then the second, each time I replaced the gaskets. I recently did a cigar smoke test to see if I can see where the possible leak is coming from, and it looks as though its coming out of both O2 sensors. I have them on fairly tight, as I can't use my torque wrench on them I can't say for sure what their values are. I'm thinking it maybe caused by the 18mm to 12mm adapters, and not getting a good seal cause it has an extra set of threads. Have any of you guys experienced this? Would looking into some kind of gasket help, or maybe switching the 12mm's out for 18mm? I have tried searching for 18mm O2 sensors, but the ones I find say they are a "might fit" part for my SG. and not sure about the plug end going to the ECM if it's even the right plug? any advice you guys could give would help a ton. Thanks in advance.
