I have a 2018 GT. JLT CAI, Stainless Works (w/Cats) LTH, and Borla CatBack.
After installing the LTH, I uploaded a Bama tune from a RevX (SCT) tuner. After several miles, I tripped a few CEL codes including P0316, P0300, P0420, P0430, P06E4. The guy who installed my LTH ran diagnostics and...
I've added a Ford Performance/Borla catback exhaust, JLT CAI, and Stainless Master Long Tube headers which I thought would be simple enough to gain a few HPs on my 2018 GT with 21,000 miles. I also had BAMA send me a tune file on an SCT tuner.
Ugh, now every 100 miles or so the engine light...