I just got a DC header from a guy for my 91 Si B20, he says the header is only got 1 O2 sensor spot. my manifold has 2 on it. he said he spliced it into 1 and had no prob. what should i do? it will be here friday, so i need advice now. will having 1 make my car run bad, i know i'll probably have engine light on. i already have egr disengaged. with no probs. hook me up.

 

you should find answers here https://honda-tech.com/zerothread?id=317499

 

well that one looks different, but i get the point, i need both of em or my car will run like ****. is that what u saying?