So it's 2017 and I need a header for my 2013 GE8. I had to remove my Weapon R header due to issues, I replaced it with the T1R. I wish I purchased the SuperCircuit header, I found out about it too late. Still might buy it, just to test it out. Most headers by now are discontinued from my search. There are a few still floating around in vendors stock.
This is what is still available that I can find (all are cat-less, all require a CEL Eliminator):
1. SuperCircuit w/o EGR
- $285 USD shipped - So beautiful.
2. T1R - $358 USD Shipped - Definitely a close second, bought from A&J Racing
3. Weapon R w/ mid-pipe - ~$300 USD - I do not recommend this, I had issues with mine and replaced it with a T1R.