Just cracked my 2013 OEM header, currently on a C38 kit/CARB tune and having a really hard time finding a used 13-16 header locally.
I did find a 2017 header, but just want to confirm my thoughts with the community/those who know better than I - but is the 2017 header redesign distinct enough that I won't be able to run the CARB tune with it? I do track this car so my risk appetite is quite low - note we don't have emissions testing so that is not a concern for me. Also I'm planning a motor swap over the winter so don't want to put much into the setup before then.
I believe I also need to open up the flange holes a bit as the 17 doesn't line up with the 13-16.
Lastly, I'll state that the difference between 13-16 and 17+ was identified in a few threads on this forum, but I've also found that the part number on Toyota side seem to cover off all model years..
https://parts.toyota.com/p/Scion__FR...U00301134.html.
Edit: Maybe this will help someone in the future; 13-16 FRS header (manual/auto) is the same part number as 17+ 86 Automatic, I replaced mine with a used '19 and it is physically identical and mated to my oem exhaust system.