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Hmmm... just attempted this homebrew idea. Lemme give a real quick background:
I had Mugen Headers and Greddy EVO. To finish it off, I got a carsound 2.5" cat. Upon installing the highflow cat, my original o2 sensor(aftercat) was stuck in the old cat so I bought a new bosch universal. Low and behold, I get CEL code 67 (catalyst system below threshold) and after some searching on po.com, someone suggested changing the precat o2 so that the before and after cat o2 sensors get similar readings due to both being new. Bought a new Walker precat o2 sensor and my CEL would light up about every 200miles of driving (same code). Each time it would light up, I'd just reset the ECU and say skrew it.. til I just got tired of doing that. So I decided to give this a try:
First off: contrary to the s2000 example picture given above, in my case the o2 bung on a 5thgen prelude is tilted more upwards. Putting spark plug non foulers would cause the o2 sensor (wire end) to not have enough clearance between the bung and the exhaust heatshield (the huge hunk of heatshield that goes all the way to the back of the car). So I trimmed a portion of that....
Second: Only 1 nonfouler would fit due to clearance. Even if you trim the heatshield away, there's still a deadend behind it.
Third: I used the 42009 (i think) nonfouler as it bolts directly into the o2 bung as well as the o2 sensor, and bored that. I had to use progressively larger drill bits until I finally reached the 1/2" size (I wish I had a drill press). The 1/2" drill bit is probably the largest you could go into the 42009 nonfouler without "boring" right through to the outside thread (hard to explain but trust me). At 1/2" boring, the Bosch sensor (remember I'm doing the aftercat o2) head BARELY fit into the nonfouler. I'm talking about MAYBE 1mm clearance around the head if even that. Notice in Daemione's post above, the universal o2 head is not only longer but thicker than an OE piece.
I dont know if that's gonna restrict any of the o2 sensor's ability to read the aftercat exhaust fumes, but I took it around for about 30miles with no CEL. I'll probably come back to give updates in a couple weeks. If there's ppl interested in doing this and want pix, I could take some, but lets wait and see what happens first.
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