Hey guys, I am running into an issue, that I've never seen before, on spark advance on a 2013 Mustang GT. This car has a cold air intake kit, catless 1 3/4" long tube headers, and catback exhaust system running good 93 octane. I primarily tune 2015+ GTs but I had this 2013 roll up for a calibration and figured it would be the same or very similar. I am having issues with Knock Retard in the midrange and at peak power and I am not sure why. I can normally command 29-30 degrees of igntion advance with no problem on full bolt on cars, but for some reason, this car keep detecting knock and will not go above what was logged, every pull. Confused...
Any help would be appreciated.
Kris