I'm stuck... Along with a "cylinder 6 misfire" issue, I also have a "Bank 2 Air/Fuel Ratio Imbalance message" as well as a "Misfire Detected on Startup First 1000 Revolutions" - My guess is these messages are all related. I replaced the spark plugs and it seemed to fix the problem for a while. I also switched the coil #6 with coil #5 and, to my chagrin, I have the same issue... I have a Flowmaster Outlaw catback exhaust and a Borla cold air intake. I'm not aware if other mods have been done to the vehicle since I purchased the car used from a dealer in Halifax in May 2020. This issue started later in the fall of last year. Anyone else encountered the same issue? and what could be possible fixes?