Ya know I am not sure on the intake thing clearly I have had four or five of them over the years but never run one. Just stuff bought and sold over the years. I tend to spend to much time and money buying lots of parts.

I prefer the O2 method but it is fair bit more expensive for sure than EGT's, not that either is "cheap" The fuel we use also seems easier to deal with using O2's than EGT's. Although if it gets to rich it can sometimes read lean on the sensor..Oh the joy of racecar tuning.