Well i removed the cat, and I have been told that with the cat removed you can space the rear o2 so the light wont come on.. how so..? I also got 2 universal bosch o2s, that ive been wanting to put on as well, my fuel mileage is pretty crappy for having fresh ignition parts. new wires, cap rotor and iridium plugs. im only averaging 18mpg.

 

On the O2 sensor spacer; assume this is what you're talking about:

http://www.ipdusa.com/product.asp?st...hStartRecord=1

 

sweet thanks but any ideas on the MPG issue?

 

It should not affect it at all since you will be doing it to the rear sensor only.

 

Have you checked your compression lately? Also a lead right foot can kill your mpg too...

 

What is it the spacer is supposed to do ?

 

It pulls the rear o2 out of the direct exhaust stream. This way it will not set a code for the cat not being there.

 

I used two spark plug de-foulers as a spacer for my OBX DP. It was 4 dollars at autozone and works perfectly. It will come with 2 de-foulers, you will need to drill one out with a 5/16th bit and leave the other just the way it is. Screw them in and you will be good to go.

The spacer takes the O2 sensor out of the way of the moving exhaust. You need to do this because when the cat is there, it slows down the air some, causing the O2 sensor to stay at a specific temperature. When you run without a cat, the O2 sensor cannot stay as hot and cause a code.

 

Compression is good, the evap line kept coming unplugged and my brake booster vacuum line was leaking fixed those and it runs way better now, still need to get the spacer though it hasnt thrown a code in a while for that..

 

Kinda surprised it didn't throw some codes for those vacuum leaks...??