Alright, my question is this, When I removed my catalytic converter, the AIR pipe tube was plugged on it, so when I was done, I put the AIR pipe back on there, not plugged, I just drilled a hole into the piece of pipe I replaced the converter with and put it back on there.

Do I need to plug that AIR Tube back up? Or will it cause problems if I leave it open?

 

Just leave it be. You can purchase whats called a converter test pipe, which is basically a pipe that can be used to replace the converter....for testing purposes. All of these pipes have the air fitting on them so you can hook your air system up. So, if they sell them the way you have yours, you should be fine.

 

the area where my converter used to be consists of the following:

a straight pipe of equal width with the AIR Tube welded to it.