Catalytic converter problems

[Elliamm_ncp9]

So i have a 2007 yaris hatchback that i recently deleted the 2 catalytic converters for less restriction and im having some problems with the check engine light. They told me that install an o2 sensor spacer and that would solve the problem. I did that, deleted all the codes and started to drive again. Everything was good until i reached to the highway that the check engine light pop out again. I have a ram air intake in the foglight with a velocity stack and im thinking that that would be a problem for the o2 sensor. Also since i deleted the catalytic converters i dont feel any gain of power, i feel that its more slow and less torquie. Any suggestions or idea to solve this?