Andrew, while I can't offer definitive information on the ECU adaptability (I have an unlocked one), I am running the S&S filter and a catless zero baffle custom straight through exhaust with stock cams. During night time runs, I've seen no evidence of exhaust flash, nor has anyone who was driving other vehicles near me reported them. Doesn't mean they're not happening, just that they aren't readily apparent. I'm guessing the exhaust run is too long to allow the flash to occur near the end of the pipe.
I ran my machine a few times with the cat less front pipes only (plus short turn outs to protect the paint) while I was fabricating the current exhaust. Nasty loud when accelerating and occasional 'flash' on the over run. Surprisingly not too loud under light throttle cruise. Then I was on the stock ECU and didn't throw any codes, but again it was just a few runs back/forth into town which is just a few miles each way.
In my youth, running an Olds 442, and later a Boss 302 Mustang, I frequently disconnected and moved aside the full length exhaust from the tubular headers which I had on those vehicles. Besides the wonderful (to me) sound, I got a spectacular light show at night on the over run.
Do you have any photos of your exhaust?
