Good to know. I have heard that the new header gaskets they provide are similar to OEM, and the complaints about their gaskets were from an earlier design. Yea I will make sure the correct header bolts are used. Kinda strange that Ford switched the thread pattern after 2011. I'm guessing maybe the newer thread pitch is less likely to loosen.
2014 Mustang GT 6R80, Procharger Stage 2 D1SC, BBK 85mm TB, Boss IM, Sai Li fuel system. Circle D 3C, 1-7/8" Kooks Long Tubes w/Offroad X Pipe, Lethal Over-Axle Pipes, Corsa Quad Axle-Back, Eibach Pro System Plus, BMR K member, Shaftmasters DS, Forgestar CF-5 Wheels and Nitto NT05 tires. Lund Tuned
Lots of suspension goodies and some other stuff I can't remember.