I have a b16a2 with the stock header, but the bung hole (02 sensor hole) was relocated near the collector for better tuning i assume? i have chrome....
Now i am looking at the tri-y header on ebay and i hear good things,but the bung hole is located on one side of the header and not at the collector....(so its not reading all of the exhaust only one side....so what should i do? make a new bung hole near the collector on the new one?

 

i would put the O2 in the collector area to get a better reading