I too, plan on keeping the car for a long time... unless I come into some serious money, or Ford makes another Mustang that would make this one worth selling. I don't want it make this noise for the entire time, although thankfully its only for the first few minutes. I will try this fix when its published although, if there is no change other than lack of power, I will have them put the stock calibration back in. Hell, I can test this theory. I will take mine to the dyno shop and let my buddy detune the cold spark. That should tell me if the noise is going to go away. I tried to take some vids tonight of the noise, but its difficult to hear. The camera that picked it up best, started rattling on its mount. I will take another crack at it tomorrow.