Catless UEL CO emission level?
 

Im planning on getting a catless UEL header for my 86, and I was discussing the emission levels with a toyota mechanic after the car was in for periodic control. The emission level on CO was measured at 0,1% and the limit for approval is 0,3%. I'm wondering how much difference removing the header cat will make?

Does anyone have a CO measurement of their car with a catless header?

I don't know 100% but based on the smell from my car, I would bet a considerable amount of money that a catless uel would fail a sniffer test.