exhaust & O2 sensor question

[dynagroove]

Hi all, i've been a long time lurker and finally decided to sign up. I purchased a 96 ti locally with the intent of doing an S52 swap. After evaluating everything that needed to be done, I decided to purchase an already completed swap from a gentleman in FL.

The issue that I have is that FL. doesn't require emissions, but where I live in NM does. Right now, the car is setup header --> resonator --> muffler. I must have a cat and no check engine lights to pass here in NM. My plan was to have a local shop install a generic cat and a bung for an O2 sensor. However, I've noticed that the M3 exhaust has 2 O2 sensors.

I'm assuming that the 98 ti wiring was used and that there will only be a single connection for an O2 sensor. I'm curious to know how this problem was solved by others needing emissions. I'm also hoping that my milage will go up a bit once this is corrected.

Any thoughts or experience are appreciated. Thanks,
Jeff H.