B15/B14 Oxygen Sensor + GTi-R J-Pipe
An unexpected complication that I ran into recently was getting the factory B15/B14 oxygen sensor to thread into the GTi-R J-Pipe. The hole for the O2 sensor on the GTi-R J-Pipe is larger in diameter then the B15/B14 sensor.
There were a few ways to get around this. One option would be to get a properly sized weld-on O2 bung and have it welded over the larger hole in the GTi-R J-Pipe. I didn’t like this option because my J-Pipe was already finished/coated, plus I didn’t think that this solution would make for a clean look. Another option would be to have another O2 sensor bung welded into the down pipe and plug the O2 sensor hole in the J-Pipe with a suitable bolt. Again, this solution brings questions of how clean it would look.
With the help of some people on SR20 Forum, I found that the factory header comes with an adapter nut that would allow the B15/B14 O2 sensor to thread directly into the J-Pipe. My factory header was long gone, so the search was on to find this part. My searching helped me find that the part I was after is commonly called an “oxygen sensor nut” and that the Nissan part number was 20607-P6500.
I have confirmed that the part number listed above will thread directly into the GTi-R J-Pipe and allow you to use a B15 or B14 factory O2 sensor. I’m sure other sensors will fit, but I have only tested the B15 and B14 sensors.