Do You Recommend 02 Extender And An Efie Or Just The Efie
 

JUST curious if i should do an o2 extender and a efei or just the efie for now? only have 1 02 sensor on my 95 jeep.

The EFIE is a more sure fire way to adjust the O2 sensor. It really all depends on what level of control you want though.

The EFIE is adjustable and can be turned off if you want.

The O2 extender is either installed or isn't installed and doesn't have any level of control beyond that.

The extender method is mainly for the sensors after the cat. The EFIE is the sure fire way to go! Like stated already it can be shut off or adjusted on the fly.