i need o2 sensors and wondering which brand i should get or should i stick with OEM.

 

OEM / Denso

 

NTK (is the OEM generally)
Denso
Bosch
Wagner

All of these seem to work quite well in the Prelude appilcations.

You are BEST off financially getting the universal types, and the OEM Rear or (if you can find it) Front O2 sensors tend to be unusally expensive. [...and are exactly the same as the universal sensors, except that with the universal sensors you need to use the splice kit as opposed to just hooking it up like the OEM ones.]

I've got experience with using the NTK OEM harnessed rear O2 sensor on the FRONT placement before the CAT, and it works fine.

I've also replaced both the front and the rear sensors with BOSCH universal sensors ($70.00 each) without ANY issues at all. [about 5 years ago Bosch was not a good option, but they work quite well now...]

Many other folks have indicated that the Wagner universal sensors work pretty well to.

 

where can i purchase discounted O2's???

 

should i purchase NGK"S?

 

NTK's... that's the O2 sensor of NGK.

Go to Rock Auto and you'll see a BUNCH of options...

http://www.rockauto.com

Notice that they have the Denso universal... and that one has a quicker response time than the NTK...

The Bosch universals and the Walkers will also work well.