| Message | It should be mounted in the down pipes, not in the test pipes. I compared my WB reading mounted in the downpipe to the dyno WB attached to the tailpipe. AT WOT, the readings are identical. But at idle and lower rpm, the tailpipe sensor reads about 2AFR leaner or so. And it's more subject to exhaust pulsation. This is a problem if you run closed loop. Also these pump cell sensors need to run at certain temperature. Running too cold will shorten the sensor life. 
www.ztechz.net ICQ # 14337317 
  
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