the answer is YES you need one. You CAN NOT TUNE at WOT a truck to its most potential without a wide band. When at a certain percent throttle the SD tables are referenced since the O2 and MAF cant make the small changes to the motor fast enough. So they go into just small changes. So dependent on tuner if they tried to lean it out a lil for more power or richen it up a little for safety how will you know if you got the most out of your tune? Its is a neccesity if you want the most out of your truck. .... This is my understanding of the subject. Moreover. You needed two more gauges. Thats one



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