I was going to get them coated. i will need some O2 extensions and some gaskets. any other things i might need. i heard something about antifoulers. what are those?

 

plug foulers for rear 02 sensors... they pull the sensor out of the jetway, the increased flow will throw a code in longtubes..also, stuff steel wool in the bottom fouler before you screw in the top fouler (which the sensor is screwed into)

 

You shouldn't need non-foulers if you are going to keep cats on the truck (moved back, which is the reason you need to extend the O2 wires). If you are going to run cat-less, you will need to do the non-fouler trick to avoid having to look at a CEL all the time...