sr20 help

[240teghan]

So whats deal with an s13 Redtop o2 sensor, ive been told completely opposite things, do i need one or not? ive Been told some guys dont use them, and some guys do. And does anyone know the bolt sizes for the sr starter? i have to get some

[801nismo104]

you need 1

[OrangeVirus1]

You need one. Ever heard of closed loop?

[KiLLeR2001]

I'd highly recommend an o2 sensor. Strangely enough, I mistakenly forgot to hook the ground wire up to my sensor and ran it like that for 5 years. I was getting about 21mpg street and 30mpg highway like this.