Wideband in tailpipe

[Ruan]

They work fine in the tailpipe as they usually have their own heater element - however that's in terms of actually giving a measurement - however they're really only any good for steady state testing (i.e. holding back on an eddy current or water brake dyno) as there is a significant delay from the exhaust gasses getting from the exhaust valves, through the manifold, down the exhaust and to the actual sensor - they naturally work better at higher RPMs where the gas is moving faster and you get a representative reading in less time...