Where to mount wideband O2 sensor.

Before I installed it I found information showing pipe color that determined temperature inside the exhaust pipe. Then installed the sensor in the supposed optimum heat range area of the collector.
(about 6 inches up from the flange.)
that's how we used to decide where to put the crossover before all the pre-built pipe setups. rattle can the pipes down stream from the collector and see where it burned off the quickest :lol: