Yeah you'll want the wideband version for any real tuning. The narrowband ones are kinda like a rough gauge of where you're at A/F-wise. The narrowband sensor is set to read only from about 12.5-13 to 15-15.5 ratios. Good for idle and cruise, not good for WOT and power. 12.5 is about as lean as you'll want to be under power, maybe 13.
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