Kenik that is good stuff. I have read this type of info before, but if you do not use it every day you tend to forget how it works. Has anyone installed Oxygen Sensors into the exchangers on our early cars? In talking to the PO, he is an engineer, he suggested the idea, which would allow for greater adjustability etc. Acquiring more info and being able to drive the car after small adjustments were made would be cool. Sort of like a modern car or having a rolling dyno test.