Our forward most sensor (upstream) is a Wide band, VIN confirmed.The O2 sensor on the car now would be a narrow band; probably can only see 14.5:1 to 15:1 or similar. A wideband gives the tuner more data; its going to be faster and more accurate when data logging. A modified engine is probably going to be tuned richer, something around ~12:1 and up. Being able to read those AFR's will let the tuner be able to customize/optimize your tune.
I'm sure Tom and others can chime in, this is just my high level overview
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