2014 non-PP. LMS 93 3 bar perf tune, catless DP. 82K miles. Went to pass someone last night and as I got up to higher RPMs and about 70mph the car backfired enough to where the check engine light flashed for about 10 seconds. The car has had some "hesitation" at highway speeds when accelerating at WOT. On WOT starts I've had some backfire/misfire type behavior, but never had the check engine light flash during an event like that. I've been wanting to change to colder plugs and I mat do that first to see if I discover the problem in the process. Any input would be appreciated.