Hi everyone
i have some question about installing the AEM X series AFR gauge
Since my Mechanic said to me, there’s no space for my 2001 EVO 7 to install the AFR O2 sensor before my stock catalytic converter. (I’m currently running a catback exhaust). It can only be weld onto downstream the catalytic converter, so I’m wondering is there going to be an issue to fit the o2 sensor after the cat? Will the reading going to be not accurate as fitting the sensor before the cat?
Thanks so much if you can help me out

 

To get the most accurate reading, the sensor really should be placed before the cat, since the cat will change the content of the exhaust gas.

Straight from the website:
"mount the O2 sensor in the
exhaust system at least 18 inches downstream from the exhaust port . If you anticipate
high EGT's (over 800C), run a turbocharger, run at high RPM for extended periods of
Page 7time or plan on running leaded race fuel then you must mount the sensor at least 36
inches or more downstream of the exhaust port as all of these can cause the sensor to
overheat. On turbocharged engines the UEGO sensor must be installed after the turbo
charger, if not, the pressure differential will greatly effect the accuracy of the unit. For
accurate readings, the sensor must be mounted before catalytic converters and/or
auxiliary air pumps. "

https://www.aemintakes.com/instructi...-4100_inst.pdf