aem ems narrow band needed?

[240sxrb25]

i am converting rb25 to map sensor with the ems and have an aem wideband. just wondering if i will need the factory narrow band o2 sensor also or not. i didnt think so but would like some for sure asnwers.

thanks

[s13silvia123]

yes you would need unless you have a standalone to turn the O2 sensor off

[240sxrb25]

i stated that i have the aem ems.

[eh?]

No you don't need the narrow band sensor. They pretty much want you to use the wideband for closed loop o2.