You would need a computer that would work with a wide band O2 sensor. Your computer will work with a stock O2 sensor so that's what you should get.
The difference is that a stock, or narrow band, oxygen sensor can only read A/F ratio values in a very narrow band around the stoichiometric A/F ratio. This information is used during closed loop mode to maximize fuel economy and emissions. At WOT, you are running in open loop mode which means that the computer is calculating how much fuel to provide to achieve a rich A/F ratio that is outside of the measurable range of the O2 sensor.
A wide band O2 sensor would be able to measure A/F ratios for the entire range that your engine could safely use. They're usually used for tuning on a dyno.
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