Ok so i guess my question is.. is this hole supposed to be attached to somewhere by that flange or is it supposed to be capped off or what? I just find it wierd that from the manifold to the wastegate there is an open hole that just releases...pressure?
Also, i got the o2 sensor bong welded to my downpipe to drop the sensor in, and when i put my downpipe back on, the CEL light comes on, but it didnt before. Is this because now the hole on the end of the turbo is capped, but there is no sensor in yet? The sensor wasnt in before, and the hole was open, and the CEL light was off. Keep in mine this is not for the above picture, this is a hole on the side of the turbo where the downpipe adapter plate would cover.
![](http://img5.imageshack.us/img5/5045/dscn15117wx.jpg)
Also, i got the o2 sensor bong welded to my downpipe to drop the sensor in, and when i put my downpipe back on, the CEL light comes on, but it didnt before. Is this because now the hole on the end of the turbo is capped, but there is no sensor in yet? The sensor wasnt in before, and the hole was open, and the CEL light was off. Keep in mine this is not for the above picture, this is a hole on the side of the turbo where the downpipe adapter plate would cover.