When I get the "Catalyst System Efficiency Below Threshold" error that just means my secondary O2's are picking up that I have no cats right?

 

yes that is right.

 

pretty much, it thinks they arent working properly, and of course they arent,lol. I wonder if you have had any engine issues since removing the cats,O2 readings being off due to no cats can effect the engines funtioning, buy way of the computer.

 

i put O2 spacers in only time i ****s up is when i take it outta tow/haul and MDS kicks in for awhile