It never happens when the engine is cold, but on a restart the engine will produce a loud pop or backfire. It dosent do it all the time, I never know when it will do this. Has anyone else had this happen?
might be a design quirk of the exhaust (the Thunderheader slip-on I had on my old '02 FLHR popped on decelaration). Shop said not much they could do due to its design.
Maybe give Jamie a ring so he can tweak the AFR of the map loaded in the PCIII. Best of luck.