Whats needed to go wideband O2?

[Vince86]

Title says its all basically, 93 rt tt, 550cc, 15g turbs, hotwired walbro safc2 and ARM1. I am useing a palm logger with mmcd and I am finding it impossible to lower or get rid of my knock on high load, not to mention figuring out how to get mmcd to put the graphs on my pc to look at, all i can get is the excel sheets.

So what will I need to get rid of my narrow band O2 sensors and go with wideband to be able to more efficiently tune and log my car? Assume I know nothing because I cant find enough to educate myself. (finding it hard to look for what I need on 316's site too)

Edit: for anyone who is looking for the answer to this question you need a Wideband 02 sensor and controller. only 1 is needed downstream or you can put 1 on each bank to adjust front or rear cylinders. Thanks to everyone for helping me with this. read on for lots more info on SAFC2 tuning, and many other misc questions pertaining to fuel, knock, boost, and sensors.