Update - more 5th/6th gen headers will be available on the current production run. We connected with our fabricator Wade yesterday, and there is good news. He is building a few extra sets of headers for 5th/6th gen VFRs, so they are available if anyone was thinking about the next production run. The company Wade uses to do the mandrel bending of tubes bent a few extra sets, so Wade ordered the tubing merge assemblies and hardware needed to complete them. These are part of the current production run and will all have 3 bungs for O2 sensors, which means your options are open as far as 2 OEM O2 sensors, one autotune O2 sensor, one O2 sensor for dyno tuning, etc. Passivation - an acid bath for the headers [described in depth earlier in this thread] remains an option - $90 if you want it.