Ult gets the points, it is a Random Tech Cat. That's why I posted the question, to see if anyone had another cause of the power loss, etc.
Todd, there is no way I could swap out the header and not have it noticed. Similar to Mike, my service director is a former student of mine and I taught with his parents. Also, the mechanic who usually works on my car at the dealership used to tune my MGA when I was autocrossing back in the late 60's. The last time I had it in he even noticed that I had changed cam gears! I don't have any problems with the dealership, they replaced the ECU under warranty about a month ago when it got messed up because of an electrical problem.