glowing headers can mean lean or rich, its not really a tell all symptom. You very well could be right John, as one this thing is running, there is never a lean backfire. We had the wideband o2 to moniter A/F ratio, that being said the numbers were in the safe range, but I think its a time issue and misfire keeping it from its full potential. After Flem and I spent the day at FIS in SA, i think there is a chance of some dyno tune time, but that is all up to Ed