Well theoretically, the "load" produced by most dynojets does not simulate actual on-road load conditions. The latest Claytons can simulate on-road conditions. Thing is, if you can find a wideband that's affordable and completely linear, you won't need a dyno. and won't have to spend money/time on a dyno. Yes, the wideband does cost a pretty penny, but that's why you charge your friends for it's use as well. Should pay for itself in no time.