1. Are there holes already there for the 02 sensors?
Yes. There are 4 holes total - 2 front and 2 rear holes already in the Dynatech system.
2. (a) Is it a spark plug non fouler that fixes those problems?
Yes. You can get them at any auto parts store.
Does it permanently fix that problem?
No. I still get a CEL light occasionally. The next thing I am going to do is pack the fouler with foil or steel wool as other members have done and that supposedly works.
(b) I found the non fouler that will fit the 02 sensor... do I need to put the non foulers on the back ones or all 4?
You need four non-foulers, but they only go on the REAR sensors. You have to drill one of the foulers out so that your O2 sensor will have clearance and stack it with another one to pull the O2 sensor out of the exhaust flow. See my link and look at the Picture "Y-pipe". You will see the "stacked" non-foulers.
3. Anyone want to help install? LOL
It's really not that difficult. Be sure to spray down your O2 sensors with some good spray penetrant and let it soak overnight....your sensors will come out easily if you do this!