![](/images/threads/icons/0.png)
I thought I would write this short how to since I ran into this problem recently. I picked up a GTI-R mani/jpipe, and found out that the fat o2 sensor that I had would not fit in the GTI-R jpipe. Since my current one was perfectly good, I opted to drill and tap the jpipe, instead of getting a new sensor. The size of the drill I used was 41/64th, and the tap was M18x1.5.
Have this problem?
![](http://kpapartments.com/o2_1.jpg)
Use the 41/64th bit and drill the hole out.
![](http://kpapartments.com/o2_2.jpg)
Use the M18x1.5 tap to thread the hole.
![](http://kpapartments.com/o2_3.jpg)
Now clean up the threads, and screw in the fat o2 sensor.
![](http://kpapartments.com/o2_4.jpg)
Here are the boxes doe the tools needed.
Have this problem?
![](http://kpapartments.com/o2_1.jpg)
Use the 41/64th bit and drill the hole out.
![](http://kpapartments.com/o2_2.jpg)
Use the M18x1.5 tap to thread the hole.
![](http://kpapartments.com/o2_3.jpg)
Now clean up the threads, and screw in the fat o2 sensor.
![](http://kpapartments.com/o2_4.jpg)
Here are the boxes doe the tools needed.
![](http://kpapartments.com/o2_5.jpg)